Indonesian

Abstract

Trisnaningsih, Kurniawati N. 2015. The relationship of climate on pest populations and their natural enemies in the new rice varieties. Pros Sem Nas Masy Biodiv Indon 1: 1508-1511. Rice plant in the field is often destroyed by many pest insects, one of them is brown plant hopper (BPH ). Infestation of BPH to rice plant will cause hopper burn so that it will reduce the national rice production. The purpose of this study was to determine the relationship of climate to the population of pests and their natural enemies in the new high yielding rice varieties. Study on first planting season 2011 was conducted in Sukamandi Substation and Pusakanegara Substation, West Java on 0.25 ha Ciherang variety cultivation. The observation was conducted on rice sample by counting main pests, rice stem borer, rice hopper (brown planthopper, white backed planthopper, green leafhopper), rice bug and rice armyworm. The observation was also conducted to the natural enemies, namely: spiders (Pardosa pseudoannulata, Tetragnatha sp., Callitrichia sp., Cyrtorhinus lividipennis, Paederus fuscifes, Ophionea nigrofasciata, and Coccinella arcuata), and also grain yield. Pest population was also observed. Data on climate will also be collected. Collected data were analyzed and correlated among the pests and their natural enemies. Results from the observation shown that main pests found during May to July were rice stem borer and brown planthopper with low intensity and population. The natural enemies found were spiders, namely Paederus, Ophionea, Coccinella and Cyrtorhinus on low population. Climatic factors which were an influence on insects population and their natural enemies on field observation were temperature, relative humidity, rainfall and wind.