A study on the control technologies for 4 Kinds of natural pesticides against Panonychus citri (McGregor) in organic citrus orchard | 4种天然源农药对有机橘园柑橘全爪螨的防治技术研究

chinois. 为明确有机管理背景下印楝素、苦参碱、鱼藤酮和SK绿颖农用喷洒油4种经过有机论证的天然源药剂对柑橘全爪螨的防效，进行了4种供试药剂一次喷雾施药和二次喷雾施药两种处理防治柑橘全爪螨的田间试验。一次施药处理结果表明，0.6%苦参碱水剂2 000倍液的速效性最好，药后1d对柑橘全爪螨的防效为98.57%，显著高于其他药剂；4药剂中，仅0.5%印楝素乳油1 000倍液的防效在供试期间内呈现逐渐上升的趋势，其余3药剂在施药3d后的防效均逐步下降；药后21d印楝素的防效较其他药剂显著为高，达97.54%，其次为SK绿颖农用喷洒油，再次为苦参碱、鱼藤酮和对照药剂阿维菌素。二次施药处理试验结果显示，印楝素、苦参碱和SK绿颖农用喷洒油3药剂的防效均在96.69%以上，但2.5%鱼藤酮乳油800倍液的防效较低，在88.95%～92.17%；且印楝素、苦参碱及SK绿颖农用喷洒油对柑橘全爪螨的防效优于或相当于对照药剂阿维菌素。从以上结果可知，供试4种天然源药剂对有机柑橘园的害螨均具有良好的防效，且二次施药处理的效果更为理想。

anglais. In order to illustrate the control efficacy of azadirachtin, matrine, rotenone and SK EnSpray 99 against Panonychus cirri (McGregor) in the background of organic management, the field experiments were conducted by one and two field sprays. With one spray, 2 000 times solution of 0.6% matrine. AS got the quickest response with a control efficacy of 98.57% 1 d after the spray. Among the 4 pesticides tested, only azadirachtin had an increasing effect during the trial. Azadirachtin had better control effects than others with a control efficacy of 97.54% 21 d after the treatment, and SK EnSpray 99 was secondary whose control efficacy was higher than that of matrine, rotenone and abamectin (control pesticide). With two sprays, azadirachtin, matrine, and SK EnSpray 99 had control efficacy above 96.69%, while 800 times emulsion of 2.5% rotenone EC had lower control efficacy than others, its control efficacy was 88.95%-92.17%. Furthermore, the control efficacy of azadirachtin, matrine, and SK EnSpray 99 against Panonychus citri was better than or the same as that of abamectin. It could be concluded that 4 kinds of natural pesticides tested had excellent control effect on phytophagous mites in organic citrus orchards, and two sprays were better than one spray.