The Study Of "Rana Catesbeiana And Trichogramma" Control Techniques On Main Diseases And Pests Of Rice

Ecological control techniques are integrated control measures, which refers to the use of "putting prevention first, integrated control" as the guiding ideology, struggling to dependence on chemical pesticides, exploring methods of agricultural, biological, physical to effective control pests in rice field. This study to use rana catesbeiana and trichogramma as the experiment meteiral, through 7 different treatment combinations such as each 667m2 60 rana catesbeiana processing, each 667m2 100 rana catesbeiana processing, chemical control processing, each 667m2 60 rana catesbeiana and trichogramma processing, each 667m2 100 rana catesbeiana and trichogramma processing, trichogramma processing, blank-control processing(CK), do system research of the population dynamics of rice diseases, rice pests and natural enemies, yield and quality formation characteristics of rice. The results are as following:1 The effect on rice diseases and pests of different controlMain insect pests of rice is rice planthopper and the rice stem borer(Chilo suppressalis Walker) and rice leaf roller(Cnaphalocrocis medinalis Guenee). This study shows that:(1) Rana catesbeiana have good effect on rice planthopper. With the number of rana catesbeiana increased, rice planthopper are reduce. And trichogramma have no effect on rice planthopper. (2) Rana catesbeiana and trichogramma have reached significant levels on controlling rice stem borer. Control works best is each 667m2 100 rana catesbeiana and trichogramma processing, the same as chemical control processing. (3) trichogramma have good effect on rice leaf roller and control effect over 70%. But it is not yet known that rana catesbeiana have effect on rice leaf roller. (4) Rana catesbeiana will reduce the occurrence of rice sheath blight and control effect over 15%. However, chemical pesticides can reduce the incidence of sheath blight over 50%. But trichogramma have no effect on sheath blight. (5) each 667m2 100 rana catesbeiana and trichogramma processing is an ideal model of ecological control, which can effective control main diseases and insect pests.2 The effect on rice natural enemies of different controlThis study shows that, trichogramma processing and CK have no impact on rice natural enemies, such as spider, cyrtorrhinus livdipennis, rover beetle. Rana catesbeiana processing and rana catesbeiana and trichogramma processing have litter impact on it. Chemical control processing have the greatest impact on it. Pesticides have effect on natural enemies in two aspects. On one hand, pesticides have drug harm on natural enemies and lead to a large number of natural enemie deaths. On the other hand, pesticides destroyed farmland ecological system, reducing the sources of food of natural enemies and living space, eventually leading to sharp drop in the number of natural enemies. The performance of rana catesbeiana impact on the natural enemies. There are trophic levels of the relationship between Some natural enemies and rana catesbeiana, and some niche overlap, so the survival of natural enemies decreases and it affects the survival and development of natural enemies.3 The effect on rice yield of different controlThis study shows that, seven different modes, rice yield from high end followed by: each 667m2 100 rana catesbeiana and trichogramma processing> chemical control processing> each 667m2 60 rana catesbeiana and trichogramma processing> each 667m2 100 rana catesbeiana processing> each 667m2 60 rana catesbeiana processing> trichogramma processing> blank-control processing. From the yield formation components wo can go that, E treatment of seed setting percentage and thousand kernel weight is the highest in all processing, and the grains per panicle and the effective spakely number are at a higher level. Therefore, E treatment in production mainly reflected in improved overall yield components.4 The effect on rice quality of different controlThis study shows that, ecological control of the different ways are in favour of rice milling quality increase, but chemical control (c) raise no significant influence on rice milling quality; Compared to CK, brown rice and rice rates accordingly lowered. blank-control (CK) of chalky rice rate and the chalkiness is the least in all processing. In the different control mode, long grain of rice, grain width and aspect ratio are not significantly different.