Pesticides Screening For The Controling Of Psylla Chinensis In Guanzhong Of Shaanxi Province

For the aggravated harm of Psylla chinensis year by year in the guanzhong region of shaanxi province,the six kinds of prevention and control of Psylla chinensis insecticides that 20% Clothianidin suspending agent,1.8% Abamectin emulsifiable solution,10% Imidacloprid wettable powder,2.5% high efficient Trifluoro cypermethrin emulsifiable solution,22.4% Spirotetramat suspending agent and 5% Acetamiprid wettable powder,were researched for the study of drug screening.The results show that the six kinds of insecticides have good effective in controlling Psylla chinensis.In terms of quick effect,2.5% high efficiency trifluoro chlorohydrin EC is fast,and the anti-effect can reach 92.56% ~ 93.90% in 5 days after using the drug.In terms of validity,the duration of the effect of 22.4% of Spirotetra-ethyl SC is prolonged,and the anti-effect decreased slowly in the 15 to 21 days,and the anti-effect could reach 89.74% ~ 91.04% after 21 days.20% thiamethoxam amine SC,1.8% abamectin EC,10% imidacloprid WP and 5% organism worm amidine WP are also rapidly available and good effective,and can produce a better control effect.Through the field efficacy trials of Psylla chinensis,the control measures are as follows: 2.5% high efficient Trifluoro cypermethrin EC can be used for achieving the quick effect when Psylla chinensis are serious.Using 22.4% Spirotetramate SC with long lasting period in the period of fruit expansion or fruiting period,the more time,the better,especially,reducing the dosage to achieve the purpose of reducing residues and ensuring fruit quality.Furthermore,the remaining four pesticides are used in turn during the occurrence of the whole Psylla chinensis to slow the production of pest resistance.In addition,these kinds of agents have no adverse effect on the leaf,leaf color and fruit growth of pear trees,and the safety of them is better.