A STUDY ON HIPPOTA DORSALIS Ⅱ. NATURAL ENEMIES AND CHEMICAL CONTROL
- Received Date: 1988-08-19
- Available Online: 2012-12-04
Abstract: Hippota dorsalis has seven natural enemies, most of which are preying ones. In its egg stage there are two species belonging to Telenomus spp. with rather high parasitic rate. The mean parasitic rate of early layed eggs is 5.17%, but after one month natural propagation, it can raise to 76.50%.The control methods are as follows:a. To spray 10 000-time liquid of Decis emulsion with a concentration of 2.5%, or 1 500-time liquid of Phenthoate with a concentration of 50%, the mortality of nymph will be over 93%.b. To inject 1.5-2.0ml of Methamidophos with a concentration of 50% into the base of bamboo culms, the mortality can be 90%.c. To spread a 15 cm ring on the base of bamboo culm with mixed oil composed by calcic lubricating oil, engine oil, and pesticide, the proportion of mixture should be 1:1:0.01,for preventing nymph to climb up to the bamboo culm and get food so that it will be dead of starvation, and the effect can be 90%.