Efficiency of Mycoinsecticides Controlling Pest Populations of the Brown Planthopper in Ric.pdfVIP

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Efficiency of Mycoinsecticides Controlling Pest Populations of the Brown Planthopper in Ric.pdf

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Efficiency of Mycoinsecticides Controlling Pest Populations of the Brown Planthopper in Ric

1Efficiency of Mycoinsecticides Controlling Pest Populations of the Brown Planthopper in Rice. A Simulation Model CEC Research Contract TS3* - CT92-0018 February 1996 1 Introduction: Biological control of insect pests of rice Rice (Oryza sativa L.) is one of the most important cultivated plants of tropics and subtropics. Next to wheat and maize, it is in the third place of global cereals production. In suitable regions it is tilled already for long times by sowing directly or by transplanting, and represents the main food there. Many diseases and pests are impairing the crop, total losses occur many times. A cicada species, the Brown Planthopper Nilaparvata lugens STAL., is of particular importance, because it is responsible for the transmission of rice vi- russes which are called grassy stunt, ragged stunt, and wilted stunt viroses. Infected rice Claus Peter Ortlieb Institute of Applied Mathematics University of Hamburg Dieter H. Kn?sel Institute of Applied Botany University of Hamburg Hopperburn of Rice, Java Indonesia January 1994 2plants are yellowing and dieing away, called hopperburn. Ordinarily, the rice fields are invaded by long-winged adults. 7 - 10 days after oviposition, they are developing from eggs into nymphs which are passing through five stages during 13 - 15 days. After that, the short-winged cicada is prevalent until rice bloom. The females are hidden among tillers at the base of the hills. At the beginning of the harvest the long-winged migrating adult is developing. The Rice Ragged Stunt Vi- rus (RRSV) has been studied exhaustively, its spreading included. It is adjoined the subgroup 3 of Phyto- Reovirusses. The replication within the Brown Planthop- per is beginning three hours after acquisition by sap suk- king. Having passed through a latent period of ten days, the cicadas are transmitting the virus lifelong. Specially proved insecticides are applied for the purpose of controlling the Brown Planthopper. It cannot be excluded that residues o