Influnce of the Rice Growing Stages on the Population Increase of White-backed Planthoppcr, Sogatella furcifera
Huang Ciwei, Feng Bingcan (Instiute of Plant Protection, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, P.R.China)
The experiments indicated the distinct effects of feeding on rice plant at different growing stages on the growth, development and population increase of whitebacked planthopper, Sogatella furcifera (Horvath). Feeding on rice plants at jointing stages resulted in the longest life-span of the adults, greatest number of eggs oviposited by per female, highest of innate capacity of increase and quicker built-up of the population. It was also found that the food intake was iargest, rate of eclosion, ratios of female population and brachypterous adults were highest on the plants at the tillering stage of rice.Food condition became worse after heading stage of rice and was unfavourable for the development of the insect population.