Crop loss assessment of mangosteen's leaf damage due to young leaf eating caterpillar by leaf cutting simulation
2001
Kriengkrai Jumreonma(Department of Agriculture, Bangkok (Thailand). Entomology and Zoology Div. Fruit Tree, Herb and Spice Crops Entomology Research Group) | Sarute Sudhi-Aromna(Department of Agriculture, Bangkok (Thailand). Entomology and Zoology Div. Fruit Tree, Herb and Spice Crops Entomology Research Group) | Wit Namruangsri(Department of Agriculture, Bangkok (Thailand). Entomology and Zoology Div. Fruit Tree, Herb and Spice Crops Entomology Research Group) | Umpika Poonnachit(Department of Agriculture, Bangkok (Thailand). Horticulture Research Institute. Chanthaburi Horticulture Research Center)
Effect of young leaves damage on crop loss of mangosteen was carried out by leaf cutting simulation of insect damage caused by leaf-eating caterpillars at 0, 25, 50, 75, and 100percent of the total leaf area from the last leaves flush. The trials were carried out at farmers orchard and Chantaburi Horticulture Research Center (CHRC) during December 1995-September 1999 and were in RCB design with 5 treatments of 10 replications at the farmers orchard and of 6 replications at the CHRC. The results showed that the trees with high level of cutting leaves or damage would flush the new shoots for compensation. New shoots needed at least 9 weeks for development to be the flowers during the proper flowering period. The young leaves damage caused by cutting at 25, 50, 75, and 100percent of the total leaf area would decrease the numbers of flowers to 16.9, 19.6, 15.9 and 21.6 percent respectively and also decreased the number of fruits to 16.4, 17.6, 16.8 and 19.6 percent respectively in the first year, comparing with that without cutting leaves. In the second year, the numbers of flowers were decreased to 47.3, 52.3, 62.1 and 56.7 percent respectively and the numbers of fruits were decreased to 32.3, 32.6, 37.1, and 38.8 percent respectively comparing with that without cutting leaves.
اظهر المزيد [+] اقل [-]الكلمات المفتاحية الخاصة بالمكنز الزراعي (أجروفوك)
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