Reproduction biology and population dynamics of the rice bug Leptocorisa oratorius (Fabricius) (Hemiptera:Alydidae) and evaluation of indigenous baits against the pest
2006
Guimba, J.M. | Medina, J.R., Philippines Univ. Los Banos, College, Laguna (Philippines). Crop Protection Cluster | Ocampo, V.R., Department of Agriculture, Autonomous Region of Muslim Mindanao (Philippines)
The reproduction biology of Leptocorisa oratorius was studied in the screen house and in the farmer's field. Female rice bug becomes sexually mature in 6-16 days. Adults mate 1 to 3 times (mean of 1.8 plus or minus 0.8), usually early in the morning (7-9 am) and rarely at night. In the field, the highest incidence of mating occurred during flowering stage of rice when the adult population was high. Female lays eggs 3-5 days after copulation. The number of insects caught in the baffle traps containing the indigenous baits varied. The spoiled fish baits attracted the highest number of rice bugs, followed by kuhol and shrimp at all the four crop stages (panicle initiation, flowering, soft dough, and hard dough). The catch was relatively high during flowering but declined during hard dough stage. Most of th e bugs caught were males. The population age structure of the rice bug at different crop stages varied. Eggs and nymphs were abundant during hard dough stage but adults were numerous during flowering and soft dough stages. Weather factors and availability of food could have contributed to the fluctuation in trap catches during the study.
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