Arthropod community in rice ecosystem of BPH susceptible and resistant varieties
1998
Suwat Ruay-aree (Department of Agriculture, Bangkok (Thailand). Div. of Entomology and Zoology. Rice and Temperate Cereal Entomology Research Group)
Proportion of arthropod community structure was the same in both ecosystems. Scavengers were dominant guild of 51-58 percent. Diptera, the most common found scavengers, were abundant in vegetative growth of rice. The second was phytophages (17-21 percent). They were mostly leafhoppers and planthoppers of which the green leafhoppers, Nephotettix spp. (Honoptera, Cicadellidae) was the most abundant (40-49 percent) in vegetative growth. The third were hymenoperous parasitoids. Their composition to the total arthropods was 14-16 percent and was found mainly in the reproductive growth of rice. The last group were predators (11-12 percent) of which spiders possess 58-62 percent of their proportion and were found abundant in the reproductive growth while Cyrtorhinus lividipennis (Hemiptera, Miridae) represented only 31-37 percent and found mainly on vegetative growth. The rice varieties affected on the proportion of BPH population, 19 percent of the BPH was found on susceptible while 11-13 percent of the BPH on resistant varieties. The BPH number on susceptible varieties was 1.6-2.4 times higher than resistant varieties. Obviously, Cyrtorhinus lividipennis played the role in biological control of leafhoppers and planthoppers. The competition among the natural enemies did not appear, but their population showed tendency of facilitation in biological control of the insect pests.
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