BIODIVERSITAS ISSN: 1412-033X Volume 21, Number 11, November 2020 E-ISSN: 2085-4722 Pages: 5308-5316 DOI: 10.13057/biodiv/d211135

Stem borer insects on Hopea odorata in Bogor, West Java, Indonesia

NOOR FARIKHAH HANEDA♥, MULYA FURQAN, MOHAMAD SUHERI Department of Silviculture, Faculty of Forestry and Environment, Institut Pertanian Bogor. Jl. Ulin, IPB University Darmaga Campus, Bogor 16680, West Java, Indonesia. Tel.: +62-251-8626806, Fax.: +62-251-8626886, email: [email protected]

Manuscript received: 30 July 2020. Revision accepted: 21 October 2020.

Abstract. Haneda NF, Furqan M, Suheri M. 2020. Stem borer insects on Hopea odorata in Bogor, West Java, Indonesia. Biodiversitas 21: 5308-5316. Hopea odorata Roxb. locally known as “merawan”, is a dipterocarp species that has the potentials to be developed for plantation forestry. Nonetheless, anecdotal evidence in Bogor, West Java, Indonesia, suggested that the trees suffered serious attacks caused by stem borer insects, causing defoliation of the crown and leading to stunted growth and death. This phenomenon suggests a more systematic investigation. The objectives of this research were: (i) to identify the species of stem borer which attacked H. odorata; (ii) to investigate the types and forms of the damage of H. odorata tree due to stem borer attack; and (iii) to study the effects of stem borer attack on the tree and wood of H. odorata. The results showed that all species of stem borer insects belong to Coleoptera, namely as Xyleborus perforans (Scolytidae), Xyleborinus perexiguus (Scolytidae), Platypus parallelus (Platypodidae), Belionota prasina (Buprestidae), Curculionid beetle, and Tenebrionid beetle. The number of boring holes on a single tree was 1932 holes, of which 98.6% caused by ambrosia beetles: Xyleborus perforans (1426 holes, 73.8%), Xyleborinus perexiguus (457 holes, 23.7%), and Platypus parallelus (21 holes, 1.1%). The length of boring tunnel at cross-section ranged between 2-35 cm and at longitudinal section ranged between 4-6 cm. The number of boring holes decreased along with the increasing height of tree stem. The patterns of boring tunnel at stem cross-section were branching (X. perforans, P. parallelus); encircled (X. perforans), black stains along their wall (X. perexiguus, X. perforans, P. parallelus).

Keywords: Ambrosia beetle, Coleoptera, Hopea odorata, Xyleborus, Scolytidae

INTRODUCTION and Sen-Sarma 2008). In seedling phases in the nursery, pests generally attack Dipterocarpaceae in the form of Dipterocarpaceae is one of the important plant families caterpillars, bag worm, and termites, while in planting which comprises several commercial tree species. The phase in the field, pests attack in the form of fruit tumors, members of this family constitute the dominant component shoot and branch borer, sucker liquid stems, termites, of plant communities in tropical and subtropical forests. Scarabaeidae beetles, fruit or seed pests, and wildlife Several species are popular due to their timber quality, such (Wahyudi et al. 2014). For example, the family member of as Dipterocarpus, Hopea, and Shorea. There are some Dipterocarpaceae from the Shorea group was found being advantages of Dipterocarpaceae timber for building infected with termites, fungi, leaf spots, and stem cancer construction, ship-building, railway sleepers, and plywood (Triwibowo et al. 2014). Other studies found in (Jha and Sen-Sarma 2008). Kalampangan Forest found Dipterocarpaceae trees were As we know, the population of dipterocarp trees in attacked by pathogens, such as stem cancer, tumor stem, natural forests is declining. However, the production of rotten stem, leaf blight, leaf rust, leaf patches, leaf holes, Dipterocarpaceae wood is useful for various products such and resinosis (Firdara et al. 2009). Among them, one of the as construction wood. Therefore, the planning of forest most dangerous pests in forest plantation is stem borers plantations of dipterocarp trees becomes a solution for (Duan et al. 2017) demand for timber resources. One of dipterocarp species Some stem borers which attack forestry plantation are that has the potential to be developed for timber plantation from Coleoptera groups, including ambrosia and bark is Hopea odorata Roxb, or locally known as merawan. beetles. Ambrosia beetles cause a decrease in the This species is known to have rapid growth and high productivity and quality of wood when harvested. It is survival (Junaedi 2012). According to Soerinegara and suspected that the insect serves as a vector of several Lemmens (1994), the survival rate is almost 100% with a pathogens in forest plantations, such as Acacia sp. and diameter of 53cm at the age of 25 years. Eucalyptus sp. Pest management by applying intensive Nevertheless, the development of Dipterocarpaceae silvicultural system is an alternative to reduce beetle plantations consisting of only a single species is vulnerable populations in natural and industrial timber plantations to pests and diseases. In developing forest plantation, pest (Gitau et al. 2013). For instance, in Sweden, many fallen frequently becomes one of major problems for trees caused by storm became the hosts for ambrosia and management. Tree species from Dipterocarpus, Hopea, bark beetles and spread to other standing and healthy trees. dan Shorea have a broad spectrum of pests, which attack Then, the solution was to regularly cut down the trees that the seeds, seedlings, fruits, timber, and forest stands (Jha have collapsed due to storms in order to reduce the source HANEDA et al. – Stem borer insects on Hopea odorata 5309 of inoculum for the spread of beetle attacks (Kärvemo et al. the diameter of boring holes (x) was classified into five 2014). Horizontal phytosanitary processes have been groups: diameter 0

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Percentage of boring holes Discussion Percentage of boring holes (P) constitutes the ratio of Species of stem borer insects attacked H. odorata trees the number of boring holes for each diameter on whole in this study are further described as follows. segments to the number of boring holes for all sizes on all segments. Xyleborus perforans The observation results showed that imago of Xyleborus perforans had small size with the body length of ± 2.5 mm, body width of ± 1.5 mm, and reddish-brown color (Figure 1.A). According to O’donnell (2014), Xyleborus spp. is Where : categorized as wood borer (heartwood and sapwood). It is P : Percentage of boring holes (%) also included ‘ambrosia’ beetle (Harrington et al. 2011). Gx : Number of boring holes for each diameter on all This insect has natural enemies from the aves group. segments Research by Fullard et al. (2010) identified 75.7% of the N : Number of boring holes for all sizes on all segments feces on the bird's nest Aerodramus sawtelli found X perforation fragments of 75.7% of all examples. This is the basis that this species of wallet bird may be a managing RESULTS AND DISCUSSION agent for pinhole borer beetles. Symptoms of Xyleborus’ attack were identified as Species of insects attacking Hopea odorata trees boring holes with diameter of ± 2 mm. From the boring Table 1 shows insect identification result, which holes, there was fine-grained powder. Tree’s stems which indicates there were six of the 12 pest insects that were were severely attacked would appear dirty, due to the found during the study categorized as stem borer and presence of brown wet dirt, which was a mixture of boring belong to Coleoptera order. The insects from the orders of powder, fungi, insect feces and tree juices. Inside the stem, Thysanoptera and Dermaptera were not categorized as stem the beetle would create constructed perpendicular to the borers. trunk, in a horizontal plane, and consists of a primary Thysanoptera or thrips are insects with spinose wings. entrance tunnel that, over time, branches into 2-5 secondary Some of the insects have wings, while others do not. Thrips tunnels (Brar et al. 2013). According to Beaver et al. have sucking type mouth and exhibited simple (2014), they made a gallery system consisting of irregularly metamorphosis. The bodies had very small size, about < 6 branched tunnels, usually in one horizontal plane, but mm. These insects ate various parts of plants, such as sometimes spreading in three dimensions and without wood, fruit, leaves, and fungi (Gibb 2015). The observation brood chambers. results showed that Thysanoptera insects have very small, This species sometimes attacks fragile or injured flat and slim bodies with body length of ± 1 mm, body timber, and becomes a minor pest, but it is always a width of < 1 mm, and white, yellowish, or clear body color secondary attack (Browne 1968). Because of its plentiful, with red and orange dot or line. The thrips that had been this species can become an important pest in decreasing the observed were predicted from suborder Tubulifera, which quality of newly harvested wooden. In Thailand, this places eggs inside crevices or under barks. According to species can be found in rubberwood (Kangkamanee et al. Sangyeot (2016), this insect is generally known as an 2011). This species is also found in stressed mango trees important pest that influences agricultural productivity, (Sittichaya 2012). It was reported in a study by Misra et al. nonetheless not many people knew that some species of (2020) that pomegranate shot hole borer (X. perforans) is a thrips are predators of mites and small lice that have transmission medium for pathogenic fungi wilt on potential for biological control. commodity pomegranate trees in India.

Dermaptera is insects that have elongated, slim and slightly flattened bodies. The wings are folded when the Table 1. Species of insects found in the stems of Hopea odorata insects were resting, and this insect exhibited simple trees metamorphosis. The bodies had sizes ranging from small to medium (4 - 26 mm). This order has biting and chewing Species Family Remark type mouth and long antennae; lived in bark part and eats Xyleborus perforans Scolytidae * Borer decay materials (Coulson and Witter 1984). The Xyleborinus perexiguus Scolytidae * Borer observation results showed that Dermaptera insect had Platypus parallelus Platypodidae * Borer small size with body length of ± 5 mm, body width of ± 2 Belionota prasina Buprestidae * Borer mm, and in their behind part, there were tweezers with Anomala pagana Scarabaeidae * Defoliator blackish color. - Curculionidae * Borer Most Dermaptera was active at night and hide during - Tenebrionidae * Borer - Thripidae ** Predator day time in crevices and inside small holes under bark - Thripidae ** Predator (Alford 2012). Many Dermapteras acts as pest predators - Thripidae ** Predator (Alford 2012). As well as Thysanoptera, the Dermaptera - Heterothripidae ** Predator found in this research was strongly predicted as predator. - Forficulidae *** Predator This study is most focused on Coleoptera insects which act Note: *: Order Coleoptera, **: Order Thysanoptera, ***: Order as stem borer insects Dermaptera

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A B C

D E F

Figure 1. Imago of stem borer species: A. Xyleborus perforans, B. Xyleborinus perexiguus, C. Platypus parallelus, D. Belionota prasina, E. Curculionid beetle, F. Tenebrionid beetle. Bar = 1000 um

Xyleborinus perexiguus aposymbiotic interaction of Fusarium euwallaceae fungi Similar to Xyleborus perforans, this species was with ambrosia beetles on avocado trees indicate that the categorized as ‘ambrosia’ beetle. When boring into the spread of pathogenic fungi is not far from bore-hole beetles wood, the female beetles carry ambrosia fungi into the (Freman et al. 2019). boring tunnel as food for the larvae and imago. Based on the observation results, the shape of imago of Xyleborinus Platypus parallelus perexiguus was almost similar to Xyleborus perforans, due Observation results showed that imago of Platypus to their close kinship within one family. However, this parallelus had small size with its body length of ± 5 mm, species had smaller size, with its body length of ± 1.5 mm, body’s width of ± 2 mm, and blackish color (Figure 1.C). its body width of ± 1 mm, and blackish-brown color According to Tarno et al. (2014), They had body’s length (Figure 1.B). ca. 4 mm, with clubbed antenna, round and convex eyes, This small and slender oriental ambrosia beetle appears and brown body. They are usually referred to needle hole naturally from Sri Lanka spread Southeast Asia, and in borer. These beetles are wood borer and they bore live Sulawesi Indonesia (Beaver 2015). Reported from data trees, but seldom attack healthy trees. These beetle attack species from West Africa (Gabon), Xyleborinus pexiguus is broadleaved trees and conifer. Euplatypus parallelus (F.) one of the most numerous of scolytine collected during (Coleoptera: Curculionidae) is one of the most invasive intensive insect traps from January till March 1999 (Basset species of all the Platypodinae. It penetrates the xylem and et al. 2001). According to Gohli et al. (2016), the spreading oviposits in its host trees thereby weakening the trunk of the ambrosia beetle genus Xyleborus, in addition, has causing them to break under extreme conditions (Lei et al. been distributed by the activity of sending wood material 2020). The subfamily Platypodinae encompasses more than by humans, however, several million years ago it was one thousand species of ambrosia beetles, but most are proven that the groups of beetles were genetically present tropical kind, and the genus platypus is the only Palaearctic in most of their distribution range so it is no astonishing distributed. Platypus spp. mostly attacked broad leaves that this species is founded in every tropical and (Ploetz et al. 2013). P. parallelus is known to attack living subtropical zone. trees that have been damaged whether by fire, drought, This type of beetle tends not to be selectively in using a pathogens, or other causes. (Beaver 2013). host tree (Browne 1961). Data from Panama shows that this All Platypus spp. are ambrosia beetle. P. parallelus, species is predominantly found in the canopy, but unlike X. originating from south and central America, now exist in crasssiusculus this type does not indicate a height almost all oriental regions, and in some parts of Wallacea alternative. This species is not considered an aggressive and new guinea. The actual source and original import site type (Browne 1961), but all ambrosia beetles have the is unknown, but has been widespread in Sri Lanka since potential to spread pathogenic fungi to host plants. 1970s and habitat in Malaysia, Indonesia, and Thailand According to McPherson (2013) that ambrosia and bark from the 1980s (Beaver 2013). The process of spreading beetles penetrate the trunk of the Quercus agrifolia tree by ambrosia beetles groups is by natural processes or through bringing along the pathogenic fungus Phytophthora human hands, but they will usually develop in areas with ramorum, caused the rapid death of many trees in climatic conditions appropriate for reproduction and California and Oregon. However, research on the development (Rassati et al. 2016). This species prefers

5312 BIODIVERSITAS 21 (11): 5308-5316, November 2020 areas with a steady, warm, rainy climate, which indicates more than 60,000 species described (Oberprieler et al. that tropical and subtropical areas would be ideal areas 2007). Four-fifths of all beetles are in the Curculionidae (Tang et al. 2018). The larva and the adult eat the 'ambrosia family. Curculionoids are spreading throughout the world, fungi which grow on the wall of the boring tunnel. This found in all types of plant vegetation (Sauvard et al. 2010). beetle itself does not eat the wood. Platypus species usually The beetle of family Curculionidae is also referred to make boring tunnel with greater area in the sapwood and kumbang moncong (snout beetle) (Husaeni et al. 2006). they are able to extend the tunnel to the heartwood. Most The observation results showed that the imago sizes of this Platypus is pest of round wood, or newly sawn timber. species were as follows: its body length ± 4 mm, and its However, several of them attack damage tree stand or body width ± 2,5 mm, while the color was black (Figure unhealthy stand. In several cases, they even attack healthy 1.E). trees (Speight dan Wylie 2000). Additionally, under All snout beetles (except several of them which favorable circumstances, ambrosia beetles may change occurred in ant nests), are plant eaters and many of them their behavior and start attacking healthy trees (Ploetz et al. are serious pests. Several species of them lived in barks or 2013), which represents an additional concern to forest dead stems. Nearly all plant parts could be attacked, keepers. In the majority of studies, the attacks by P. ranging from the root to all parts above the roots. During its parrallelus appeared to be secondary on trees that have life cycle, the bark beetle reproduces in logs from which it already been damaged by pathogens or other causes, rather flies to host-trees to dig feeding galleries and overwinter than primary attacks on healthy trees. However, the (Ruano et al. 2010). According to Huda et al. (2019), snout primary attacks can happen ( Bumrungsri et al. 2008). They beetle constitutes one of the family of order Coleoptera are usually closely associated with fungi, which may be which becomes stem borer in larvae stage. Based on pathogenic causing tree mortality( Gümüş & Ergün 2015). research by Pineda et al. (2014), beetle type of the This species is most serious pest and most abundant species Curculionidae family known as bark beetle on host plants of platypodine in some areas at lower altitudes (Beaver (Pinus greggii). The results of scanning trees on post- 2016). outbreak host plants show that the beetles were found on all parts of the trees sampled. Belionota prasina Some species, mature and larvae of Curculionoidae are The observation results showed that imago of Belionota pohytophagous. The larvae are mostly endophytic or prasina had small size with its body length of ± 20 mm, its underground. The beetles consume all variety of plants, body width of ± 7 mm, and bluish dark green color, while attacking all parts. Many species are important pests for the larva was yellowish-white (Figure 1.D). According to agriculture and forestry (Sauvard et al. 2010). Several Ramasamy (2018), the observation results of grown insects species of snout beetles bore stems, mainly during larval B. prasina have a dark greenish-blue color with a size stage (Kalshoven 1981). Its eggs are usually prepared about 21-28 mm. The larvae have a yellowish-white color inside the plant tissue. In the beginning, the female insect with a body-sized 9-50 mm. Many larvae of Belionota only bored phloem tissue. The following description explains makes hole with its snout (long and sharp mouth). the life cycle variation of this phloem borer, whose heads Afterward, the eggs were inserted into the hole which has are flattened. In general, this beetle prefers weak and been made, by using pygidium which resembles ovipositor damaged host. The imago places the eggs on the surface or (apparatus for placement of the eggs) (Pracaya 2007). cracks of the host's bark. Afterward, the larvae bore into the phloem, where it creates oval chamber with crosswise Tenebrionidae beetle direction. Pupation occurs in that chamber or sometimes Tenebrionidae contains around 20,000 species and inside the xylem. After that, the imago emerges and bores 2,300 genera belonging and settled in tropical habitats until reaching the outer surface (Coulson and Witter 1984). (Beutel and Leschen 2005). In general, these insects Adult beetle never enters again into the host tree after it become pests that consume plant material, including rotting went out. Therefore, only larvae chambers exist in the inner material, wood, leaf litters, pollen, mushrooms, and algae. part of the bark. This larva never goes out because there are Some temporary decomposers, some of them predators, no holes in the surface. Therefore, the arching larvae’s especially wood borer beetles (Soldati and Soldati 2003). chamber is always filled with the larvae of this species Some studies note that tenebrionid species, dark beetles (Anderson 1960). Australian Buprestidae, popularly may be the basis in important processes of ecosystem known as 'jewel beetles' has many host-plant as function such as environmental quality indicators, because Mangifera indica, Ceiba pentandra, Delonix regia, and their existence indicated that the area in question is Casuarina sp. (Bellamy et al. 2013). According to relatively undisturbed but the majority of these insects are Schnepp et al (2020), B. prasina population in Florida decomposers (Hwayyiz et al. 2016). (Unites State) is genetically diverse and may only be The observation results showed that imago sizes were attracted to dead or declining trees. as follows: its body length was ± 12 mm, its body width was ± 5 mm, while the color was blackish brown (Figure 1.F). Curculionidae beetle. These beetles live in darkness. Tenebrionidae beetle is in The Curculionidae family including the Superfamily varying. Most of them have brownish or black color. Several Curculionoidaea is a beetle of wood, bark, and ambrosia. species have rough bodies and slightly resemble wood This superfamily is the most various species beetles, with barks. It is very common to find them under loose bark. Most

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Tenebrionidae have wide range of consumption preferences number of boring holes was 188 holes per stem segment (Brygadyrenko and Nazimov 2015). Other insects found in with length of 1 m, whereas the length of boring tunnel on the sampled trees were Thysanoptera and Dermaptera cross section ranging between 2-35 cm and 4-6 cm in the although both are considered as predator than stem borer. longitudinal section of the stem. The effect indicated that Thysanoptera or thrips are insects with spinose wings. the dominant attack on the rosemary tree is the group of Thrips have sucking-type mouth and exhibit simple ambrosia beetles. The kind of ambrosia beetles that are metamorphosis. The bodies have very small size, about < 6 considered to be polyphagous has a large uterine tolerance mm. These insects eat various parts of plants, such as so that in some cases it is dominantly found to attack wood, fruit, leaves and fungi (Gibb 2015). The observation plantation and forestry. The results of this research are in results showed that Thysanoptera insects have very small, line with Flechtmann et al. (2001) that the results of the flat and slim bodies with body length of ± 1 mm, and width trap method research on the strength of Eucalyptus and of < 1 mm and had white, yellowish, or clear body color Pinus taeda in Brazil, so the dominant type has been found with red and orange dot or line. The thrips that had been is the type of Xyleborinus beetles. The trap results of the observed were predicted from suborder Tubulifera, which two ecosystems are not significantly different so it can be places eggs inside crevices or under barks. According to concluded that the known type of ambrosia beetles has a Sangyeot (2016), this insect is generally known as an large host-plant (polyphagous). important pest affects agricultural productivity, nonetheless Figure 2 presents the result of regression analysis to some species of thrips are predators of mites and small lice investigate the relationship between the number of boring that have potential for biological control. holes and tree stem height. From the equation resulted from Dermaptera is insects that have elongated, slim, and the regression, it can be seen that there is a negative slightly flattened bodies. The wings are folded when the correlation, implying that the number of boring holes insects are resting, and these insects exhibit simple decreased with increasing height of the tree stem. metamorphosis. They have varying body size, from small According to Kuswana (2003), this phenomenon is caused to medium (4-26 mm). This order has biting and chewing by several factors, including: (i) the lowest part of the tree type mouth and long antennae; lives in bark part and eats has greater diameters than the upper part, so that the room decay materials (Coulson and Witter 1984). The observation for insects’ growth is larger; (ii) factors of temperature and results showed that Dermaptera insect had small size with humidity, in which in the lowest part of the tree stem has body length of ± 5 mm, body width of ± 2 mm, and in their lower temperature and higher humidity than the upper part, behind part, there were tweezers with blackish color. making this condition supports the growth of ambrosia Most Dermaptera are active at night and hide during fungi and insects; (iii) habit of flying which is dominant at daytime in crevices and inside small holes under bark lower height (1–2 m above ground surface), causing attacks (Alford 2012). Many Dermapteras acts as pest predators to be more frequent in the lowest part of the tree stem; (iv) (Alford 2012). As well as Thysanoptera, the Dermaptera density of undergrowth vegetation and tree crown could found in this research was strongly predicted as predator. reduce the light intensity entering the lower part of the stand; (v) large amount of groundwater that affects the humidity Number and length of boring holes of the lowest part of the stem. This is also supported in the The result of boring holes calculation is presented in research by Pineda et al. (2014) that the number of mature Table 2, which shows that the number of boring holes beetle individuals was significantly different among being found was 1932 holes. About 97.5% of the holes sections of the trunk (H = 12 10, df = 5, p <0.05) in which were created by Scolytidae beetles: Xyleborus perforans more bark beetles were found at the trunk base and first (1426 holes, 73.8%); Xyleborinus perexiguus (457 holes, two sections above the base than in the higher parts on the 23.7%), while 2.5% were created by other beetles. trees. No difference was found in total abundance of bark Tenebrionidae beetle created only 3 holes (0.1%). Average beetles among trees (H = 15.2, df = 7, p> 0.05)

Table 2. Number of boring holes found in tree stem of Hopea odorata

Diameter of boring holes (x) (mm) Segment ∑ 0 < x ≤ 1 1 < x ≤ 2 2 < x ≤ 3 3 < x ≤ 4 4 < x ≤ 5 I 56 154 1 5 0 216 II 85 199 1 3 0 288 III 78 192 2 3 0 275 IV 77 157 1 2 0 237 V 29 148 3 1 0 181 VI 13 144 5 0 0 162 VII 20 115 5 2 0 142 VIII 21 124 0 2 1 148 IX 27 99 3 1 0 130 X 19 75 2 2 0 98 XI* 32 19 2 0 2 55 ∑ 457 1426 25 21 3 1932 % 23.7 73.8 1.3 1.1 0.1 - Species X. perexiguus X. perforans Curculionid beetle P. parallelus Tenebrionid beetle -

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(Kirkendall et al. 2015). For boring holes with the A diameters of 2

number of boring holes was 1932 holes with an average of Figure 2. Relationship between the number of boring holes and 188 holes per stem segment of 1 m length. The length of the height of tree stem and size of boring hole diameter: A. All boring tunnel at cross section ranging between 2-35 cm and diameters; B. Diameter 0

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A B C

D E F

Figure 3. Patterns of boring tunnels at stem cross-section of each diameter: A. Diameter 0

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