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Biocontrol of the Carob Moth Ectomyelois Ceratoniae (Lepidoptera, Pyralidae) in Pomegranate and Citrus Orchards in Tunisia

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Biocontrol of the Carob Moth Ectomyelois Ceratoniae (Lepidoptera, Pyralidae) in Pomegranate and Citrus Orchards in Tunisia International Journal of Agriculture Innovations and Research Volume 4, Issue 5, ISSN (Online) 2319-1473 Manuscript Processing Details (dd/mm/yyyy) : Received : 07/01/2016 | Accepted on : 22/01/2016 | Published : 11/03/2016 Biocontrol of the Carob Moth Ectomyelois Ceratoniae (Lepidoptera, Pyralidae) in Pomegranate and Citrus Orchards in Tunisia DHOUIBI Mohamed Habib HERMI Nouha SOUDANI Dalia THLIBI Houda National Institute of Agronomy of Tunisia, 43 avenue Charles Nicolle, 1082, Tunis, Mahrajène. Email: [email protected]. Abstract – Ectomyelois ceratoniae is a major pest in In Tunisia, we can find E. ceratoniae in the north as pomegranate and orange (« Thomson » variety) in Tunisia well as in the south of the country, especially in Saharan causing highly economic losses. This study was performed areas where infestations can reach 90% of pomegranate in order to obtain a suitable control method for this species. fruits [7]. Field trials were conducted in two types of orchards: two Carob moth rarely attacks healthy pomegranate fruits. In Citrus orchards and two pomegranate orchards (organic and conventional). In field, the use of Trichogramma fact, females prefer to lay eggs on damaged fruits, where releases (300 eggs/tree) mass trapping (10 traps/ha), and two calyx petals touch. Larvae typically enter through mating disruption using SPLAT EC (350g/ha), seemed cracks, rotten spots, or wounds caused by other pests. promising. Results showed that mating disruption with However, if numbers are high, damage can be serious and SPLAT EC was the most effective treatment in reducing it can highly affect fruit quality. the rate of infestation by E. ceratoniae in the Citrus To reduce this damage, several control methods have orchards. In fact, after 13 days of the treatment with been experimented [2]-[4]-[5]-[8]-[9]-[10]-[11]-[12]-[13]- SPLAT EC (350g/ha), the reduction of the infestation rate [22]-[23]. Chemical control is effective against the carob reached 100%. In pomegranate orchards, the most moth. However, it is not satisfactory in field due to the effective treatment was the releases of Trichogramma . Indeed, after 8 days of the second Trichogramma release, endophytic behavior of the pest. In fact, the larvae feed the infestation level in the organic pomegranate orchard and develop inside the fruit, where they are protected from decreased from 82% to 22%. the chemicals [6]-[14]- [15]-[16]-[17]-[18]-[19]-[20]. In addition, a public awareness has arisen with the negative Keywords – Ectomyelois Ceratoniae, Attract and Kill, impacts of chemicals on human health and their harmful Trichogramma Releases, Mass-trapping, SPLAT EC. influence on the environment. Consequently, there is now a high demand for non -chemical disinfestation treatments I. INTRODUCTION while at the same time maintaining a high degree of control efficacy to satisfy International regulations and The carob moth, Ectomyelois ceratoniae (Zeller, standards necessary for export [24]-[25]-[3]. 1839) (Lepidoptera: Pyralidae) (Fig.1 ), is an important This study evaluates the efficacy of some treatment pest of pomegranate ( Punica granatum ) in Tunisia [21]- methods, in order to substitute the chemical control and to [5]. strengthen the integrated control. In fact we tested: It is also known as a pest of Citrus Trichogramma releases, mass-trapping, SPLAT EC (« Thomson» variety) (Fig.2 ) were damages can reach product and Attract and kill method, in two types of 16% [1]. orchards: Citrus orchards and pomegranate orchards (biological and conventional orchard). II. MATERIALS AND METHODS 2.1. Citrus treatments 2.1.1. Experimental fields Fig. 1. Carob moth Ectomyelois ceratoniae In 2013, we started field treatments in two Citrus orchards located in two different regions. • First Orchard (El Khlidia) The first series of fields trials were conducted in a Citrus orchard (2,25 ha) in the region of El Khlidia (in the governorate of Ben Arous). The grown variety of orange in this orchard is « Thomson ». This orchard was divided into four plots: one control plot (0,5 ha) and four plots to receive various different Fig. 2. Carob moth damage on Orange (“Thomson” treatments ( Table.1). variety) We put two pheromones traps/ha in the orchard for detecting and monitoring the pest. Copyright © 2016 IJAIR, All right reserved 849 International Journal of Agriculture Innovations and Research Volume 4, Issue 5, ISSN (Online) 2319-1473 Table. 1. Characteristic of the different plots in the first 2.2. Pomegranate treatments citrus orchard (El Khlidia) 2.2.1. Experimental fields Plot Number of Treatment Dose of the used product In 2015, other field trials were carried out in two trees pomegranate orchards: an organic orchard (0,576 ha) and a P1 156 (untreated) _ P2 203 SPLAT EC 350g / ha (2 drops/selected conventional one (0,599 ha), in the region of Kettana tree) (governorate of Gabes). The distance between the two P3 260 Mass trapping 10 traps/ha orchards is 1,5Km. P4 156 Fortune AZA (3,2% 0.25l/hl • Azaderachtin) Conventional Orchard P5 156 Trichogramma 300eggs/tree, 1card/tree, 12 This orchard was also divided into four elementary cacociae trees plots: a control plot and three other plots that were chosen to receive different treatments ( Table.3). • Second Orchard (Mornag) Three series of treatments were done: st The second series of treatment were done in a 0, 5 ha -1 series of treatments: 05/28/2015. nd orchard (169 Citrus trees) in the region of Mornag -2 series of treatments: 07/14/2015. rd (governorate of Ben Arous) ( Table.2). The grown variety -3 series of treatments: 08/11/2015. in this orchard is “Thomson”. Table 3. Characteristic of the different plots in the Table.2. Characteristic of the different plots of the second conventional orchard citrus orchard (Mornag) Plot Area of Number Treatment Dose of the the plot of trees used product Plot Number of Treatment Dose of the used (ha) trees product C1 0,19 80 (untreated) _ P’ 1 39 (untreated) _ P’ 2 31 SPLAT EC 350g / ha (2 C2 0,175 78 SPLAT EC 350g / ha drops/selected tree) C3 0,124 76 Trichogramma 25000 insects P’ 3 36 Mass trapping 10 Delta traps/ha cacoeciae / ha (5 trees) P’ 4 30 Fortune AZA 0.25l/hl releases (Azaderachtin3,2%) C4 0,11 70 Attract and Kill 400 drops/ ha P’ 5 34 Trichogramma 300eggs/tree, method cacociae 1card/tree, 10 trees • Organic Orchard The orchard was divided into four plots: three plots were 2.1.2. Control of the Treatments Efficacy intended to receive different treatments and the third one For the orchard of El Khlidia, the effectiveness of every was used as a control plot ( Table.4). treatment is determined marking a certain number of trees Two series of treatments were done in this orchard: (5 trees) in each elementary plot and counting all healthy -1st series of treatments: 07/14/2015. and attacked fruits before treatment, then, after 3, 7, 15, 21 -2nd series of treatments: 08/11//2015. and 30 days of the treatment. Table 4. Characteristic of the different plots in the organic We followed the same experimental protocol for the orchard second orchard (of Mornag), except that the examination Plot Area of Number Treatment Dose of the used of the fruits was done before treatment and after 4, 7, 13, the plot of trees product 21, 28 and 35 days of the treatment. (ha) The randomly selected fruits were examined in the O1 0.182 400 (untreated) _ laboratory under binocular microscope in order to O 0.169 300 SPLAT EC 350g / ha determine the percentage and the evolution of the 2 infestation by the Carob Moth. O3 0.12 250 Trichogramma 25000 In addition, a delta trap was placed in each plot to cacoeciae parasitoids/ ha (5 releases trees) follow the development of the population structure of the O4 0.105 200 Attract and Kill 400 drops/ ha insect (Fig.3 ). method Statistical analysis was performed through the STATISTICA (6,0). The comparisons of the averages 2.2.2. Control of the Treatment Efficacy were performed through the NEWMEN Keuls test at the In December, we put two traps per plot in the 5% threshold. conventional orchard, and in June, we put only one trap per plot in the organic orchard. On May 20, we started fruit sampling (50 fruits were collected randomly) from the different plots of the two orchards (organic and conventional) .Then, we brought these samples to the laboratory and we examined them using a binocular microscope. In early July, we detected the presence of E. ceratoniae Fig. 3. Carob moth larva inside orange fruit in the pomegranate orchards, so, we marked trees Copyright © 2016 IJAIR, All right reserved 850 International Journal of Agriculture Innovations and Research Volume 4, Issue 5, ISSN (Online) 2319-1473 randomly (with paint) in every elementary plot of the two SPLAT EC was applied as discrete point sources to orchards and we started counting all healthy, attacked and minimize its relative surface area in order to increase the fallen fruits per tree (Fig.4 ). product longevity. We applied 350g/ha of SPLAT EC on a branch of trees throughout the selected plots (Fig.7 ). Fig. 4. Carob moth damage on pomegranate 2.3. The Different Treatments • Trichogramma Cacoeciae Releases The species used is Trichogramma cacoeciae. The success of this method is based on the coincidence Fig. 7. A drop of SPLAT EC placed on a branch between the time of release and the pest oviposition period. So, we had to take fruit samples and to examine the • Attract and Kill Method population structure of Ectomyelois ceratoniae in the two This control method is based on a combination between orchards (organic and conventional orchard). In general a carob moth sex pheromone (0, 08%) and an insecticide 25000 Trichogramma /ha were used (Fig.5 and Fig.6 ).
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