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Introduction of Diadegma Semiclausum to Control Diamondback Moth in Taiwan N

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Introduction of Diadegma Semiclausum to Control Diamondback Moth in Taiwan N 29 Introduction of Diadegma semiclausum to control diamondback moth in Taiwan N. S. Talekar, J. C. Yang and S. T. Lee Asian Vegetable Research and Development Center, Shanhua, Tainan, Taiwan, ROC Abstract Diamondback moth, Plutella xylostella (L.), is the most destructive pest of cruciferous vegetables in Taiwan. As elsewhere in Asia, this insect in Taiwan has developed resistance to all chemical insecticides used for its control. Failing to find any suitable and sustainable control measure, Diadegma semiclausum Hellen - a larval parasite - was introduced to combat diamondback moth in Taiwan. Despite repeated releases, this parasite did not establish in lowlands probably because of higher temperatures coupled with indiscriminate use of chemical insecticides by the farmers. However, a single release in the highlands resulted in the establishment of this parasite, probably because of cooler temperatures and relatively less intensive use of chemicals. This has resulted in reduction in the population of diamondback moth in the highlands. In laboratory studies, D. semiclausum parasitism was high at 15 to 25ºC. Parasitism is reduced at temperatures above 25ºC. This parasite is also extremely susceptible to broad-spectrum chemical insecticides, especially synthetic pyrethroids. Diadegma semiclausum alone may not be adequate to give complete control of diamondback moth even in the highlands, because when temperatures exceed 30ºC, the diamondback moth population increases, presumably due to the mortality of D. semiclausum adults. Under such circumstances, a few applications of Bacillus thuringiensis Berliner are essential to supplement the control achieved by the parasite. Introduction Vegetables have been an important part of Chinese diet for centuries. Twenty-eight major plant species are consumed as vegetables in Taiwan. Among the major plant species, crucifers are by far the most predominant group grown over 25 % of the total hectarage planted to vegetables (PDAF 1988). These economically important vegetables are also the hosts of a large number of destructive insect pests such as diamondback moth (DBM), Plutella xylostella (L.) (Lepidoptera: Yponomeutidae), imported cabbageworm (Pieris rapae Boisduval) (Lepidoptera: Pieridae)), striped fleabeetle (Phyllotreta striolata F. (Coleoptera: Chrysomelidae)), cabbage looper (Trichoplusia ni Hübner (Lepidoptera: Noctuidae)), cabbage webworm (Hellula undalis F. (Lepidoptera: Pyralidae)), and aphids (Myzus persicue Sulzer, Lipaphis erysimi Davis, and Brevicoryne brassicae L. (Homoptera: Aphididae). DBM is by far the most destructive pest of crucifers in Taiwan and elsewhere in Southeast Asia. DBM Problem in Taiwan DBM was reported as a pest of crucifers in Taiwan over 80 years ago (Hori and Shiraki 1910). It was also mentioned as a pest of crucifers three decades later by Sonan (1942) and was considered potentially important in 1960, although its damage was quite low (Chang 1960; 263 264 Talekar, Yang and Lee Tao et al. 1960). In the mid 1960s, this insect was ranked the second most important, following pyralids on summer radish (Chen and Su 1986). Extensive insecticide screenings conducted in late 1960s indicates that DBM was already .a serious problem (Ho and Liu 1969; Lee 1968, 1969; Tang 1967). From the initial two insecticides recommended for DBM control in Taiwan in 1965, the number of chemicals registered for this purpose rose to 8 in 1970, 17 in 1975, 25 in 1980, 31 in 1984 and 35 in 1989 (PDAF 1990). Practically every year, new chemicals are added, but the ineffective old ones are rarely dropped from the recommendation list. Availability of the host-plant throughout the year, rapid turnover of generations under favorable tropical to subtropical conditions and intensive use of insecticides to combat this pest have resulted in DBM in Taiwan developing resistance to all chemical insecticides presently being used. As a result, the damage by this pest continues unabated. In some areas DBM threat has forced farmers to switch to other vegetable crops. In view of the seriousness of the DBM problem in Taiwan and elsewhere in Southeast Asia, research at the Asian Vegetable Research and Development Center (AVRDC) has been focused on finding practical control measures to reduce dependence on chemical insecticides. The alternative controls that AVRDC explored are: (1) finding crucifer cultivars resistant to DBM (AVRDC 1981a, b), (2) cultural practices such as intercropping and overhead sprinkler irrigation that will reduce DBM infestation (AVRDC 1985, 1987), and (3) use of insect viruses and Bacillus thuringiensis Berliner (AVRDC 1975, 1976). These control measures, however, proved to have limited utility for the control of DBM on a sustainable basis. From 1985 onwards, therefore, AVRDC's research has focused on the introduction of parasites of DBM to help control this pest in Taiwan and, if successful, make similar attempts in countries in the region. Parasite import and rearing Diadegma semiclausum Hellen (Hymenoptera: Ichneumonidae), a larval parasite of DBM, is widespread in Europe (Hardy 1938; Voukassovitch 1927; Rusinov 1977; Mustata 1987) and is believed to be one of the parasites that is keeping DBM population under control in that continent. This parasite has been introduced into South Africa (Evans 1939), New Zealand (Robertson 1948), Australia (Waterhouse and Norris 1989), and Indonesia (Vos 1953) to control DBM. It has become established in certain areas of these countries. AVRDC imported D. semiclausum in 1985 from Indonesia (Talekar 1988) where it was introduced from New Zealand in the early 1950s (Vos 1953), and where it is now well established in the highlands (Sastrosiswojo and Sastrodihardjo 1986). This parasite was reared on second instar DBM larvae raised on common cabbage seedlings maintained at 26 ± 2°C. The parasite pupae or adults from the routine rearing were utilized for research and field releases. Parasitism study Soon after importation, we conducted one field trial where common cabbage was planted in three 40 x 15 m parcels of land. Each parcel was enclosed on four sides and the top by fine mesh nylon net. Three weeks after cabbage transplanting, 250 DBM cocoons were introduced in the first two parcels and the third was maintained as a DBM-free check. Starting 1 week after DBM release, D. semiclausum adults were introduced periodically in one of the two cages where DBM was also introduced. Parasitism of DBM larvae was monitored periodically and cabbage yield was recorded at harvest. Diadegma semiclausum readily infested DBM larvae. The average parasitism, which was only 13.1 % about a month after the initiation of parasite release, reached 65.4% 6 weeks later just before harvest. Consequently cabbage yield increased significantly (Table 1). In fact, the yield was double that of control plot where only DBM was introduced. However, this yield was still significantly lower than in the DBM-free check. Obviously, the parasitism was not high and early enough to give complete control of DBM. Nonetheless, the experiment indicated Diadegma semiclausum in Taiwan 265 that D. semiclausum can infest DBM under Taiwan field conditions and thus has potential in DBM control on farmers' fields. Table I. Yield response of cabbage subjected to infestation by DBM with and without parasite.ª DBM status Yield (t/ha) Only DBM released 7.67 c DBM + parasite 14.83 b No insect release 30.93 a ªPlanting date: 16 Jan. 1985. DBM released: 7 Feb. 1985. D. semiclausumreleased: 14 Feb. 1985 to 4 March 1985. Harvest date: 4 April 1985. Means followed by the same letters are not significantly different at 5% level according to Duncan's multiple range test. Parasite release Based on the results of the above experiment, attempts were made to introduce the parasite at three distinct agroecological areas of Taiwan where crucifers are grown. The first location, Luchu township, is only 10 m above sea level in Kaohsiung county (Fig. 1). The second location, Yangmingshan in suburban Taipei, is 700 m above sea level. The third area, Wuling near Lishan hill station, is in the central mountain range 1700 m above sea level. At Luchu, crucifers, mainly cauliflower and broccoli, are grown in the relatively cool dry season from October to April, and rice or other crops during the hot wet season from May to September. At Yangmingshan and Wuling, crucifers - mainly cabbage - are grown in summer, from May to September, and the land remains mostly fallow throughout the rest of the year. At the latter two locations, temperatures during December-January often dip to below freezing. At all three locations, DBM is endemic and has developed resistance to practically all insecticides presently being used in its control. At all three locations parasite release was supplemented by application of Bacillus thuringiensis Berliner. At Luchu 35,166 D. semiclausum cocoons (emergence 75-80%) were released between October 1985 and April 1986 over a 15-ha area. Despite apparent suspension of chemical insecticide, D. semiclausum failed to parasitize DBM larvae and no adults were visible in the field. The native parasite Cotesia plutellae Kurdjumov (Hymenoptera: Braconidae) was present and its parasitism reached 27 % . At Yangmingshan 35,600 D. semiclausum cocoons were released over a 10-ha area. During a weekly monitoring survey, only on three occasions was D. semiclausum found parasitizing DBM larvae; the parasitism ranged from 4.5 to 7.6%. Cotesia plutellae, however, parasitized 35-40% of DBM larvae. At Wuling, about 35,000 D. semiclausum cocoons were released on a 17-ha area 2 weeks after cabbage transplanting in April 1986. Within 1 month, DBM parasitism reached 75 % . After this, the DBM population was reduced so drastically that no further observations could be performed. There was no difference in the yield obtained during 1986 and the previous year, but the cost of insecticide used was reduced from NT$42,000 to 17,000/ha in 1986 (1 US$ = 36 NT$) and frequency of spraying from once a week to once every 9-10 days (Talekar 1990). Parasite establishment Among the three locations where D. semiclausum was released, Wuling is the only site where the parasite has become established (Fig.
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