Dynamics of rice planthoppers (RPH) and natural enemies using yellow paper sticky trap and existence of rice stunt virus after outbreak as a buffer management to RPH control
Brown planthopper (BPH) outbreak had often occurred in Indonesia, especially in West Java, among others Subang and Karawang as a hot spot areas. The research of dynamics population of rice planthoppers (RPH), natural enemies and existence of rice ragged stunt virus (RRSV) to anticipate rice damage was carried out in rice field at Sukamandi research station of Indonesian Center for Rice Research (ICRR). The results showed that the BPH and whitebacked planthopper (WBPH) population were very low and didn’t damage to rice crop, and also didn’t find symptoms of RRSV and grassy stunt virus (RGSV) after outbreak of both BPH and RRSV. Monitoring of RPH and natural enemies on DS 2011 using yellow paper sticky trap (YPST) was very good and effective as well as visual counting. Population of BPH and spiders on visual counting was lower than on YPST, but in WS 2011/2012 otherwise. The WBPH population and Paederus fuscipes on visual counting was higher than on YPST on both DS and WS. The population of Cyrtorhinus lividipennis on YPST observations was significantly higher than on visual counting on both DS and WS. The general results of pests and natural enemies with visual counting wasn’t always higher than YPST observation, and vice versa.This depends on the abundance and movement activity of each pests and natural enemies. Control to BPH and WBPH by insecticide on economic thresholds based on natural enemies (predators) didn’t require to be done on both the DS and WS, due to the value of RPH corrected by natural enemies (Di) always lower than the economic threshold that have been set based on the price of grain at harvest.This indicates that the presence predators of spiders, Lycosa pseudoannulata, P. fuscipes, and C.lividipenis have been able todecrease the population of rice planthoppers.