点喷饵剂对芒果橘小实蝇的防治效果

The control effect of bait spray on Bactrocera dorsalis in mango

为探讨芒果园中饵剂对橘小实蝇的防治效果及施药时期,在芒果成熟期监测了橘小实蝇[Bactrocera dorsalis(Hendel)]成虫发生动态,比较阿维菌素0.1%饵剂不同剂量对芒果的保护效果。结果表明,橘小实蝇发生高峰期与芒果成熟期相吻合,成熟前果园中橘小实蝇的密度较低,诱捕到成虫数低于60头/诱捕器,开始有黄熟芒果或落地果时,虫量快速增加,最高为1082.3头/诱捕器,采收结束后,虫口快速下降。使用阿维菌素0.1%饵剂2250、2700、3150 g/hm^(2)点喷,对芒果具有较好的保护效果,大部分处理与对照药剂2.5%高效氯氟氰菊酯水乳剂稀释1500倍液的防效差异不显著,对树上果的防控效果最高为82.1%,落地果为87.5%,采后果为79.5%。阿维菌素0.1%饵剂推荐使用方法为虫口暴发初期开始施药,使用剂量为3150 g/hm^(2),对植株点喷,每株果树喷药面积为1.0~1.5 m^(2),避免果实接触药液,间隔7 d施用,直至采收结束。

To investigate the applying time and the control effect of baits spray on Bactrocera dorsalis in mango,this study monitored the dynamics of adults during the ripening period of mango,and compared the protective effects of different doses of avermectin 0.1%baits on mangoes.The results showed that the havest time was the peak period of occurrence of fruit flies.The density of fruit flies in the orchard was relatively low before ripening,and the number of trapped adults was less than 60 per trap.When there were ripening fruits or fallen fruits,the number of adults rapidly increased,the highest number was 1082.3 heads per trap.After harvesting,the insect population rapidly decreased.The use of abamectin baits with concentrations of 2250,2700 and 3150 g/hm^(2) had a good protective effect to fruits,but there was no significant difference between most treatments and the control agent 2.5%cypermethrin EW diluted 1500 times.The highest prevention and control effect of fruits in the tree was 82.1%,was 87.5%to fallen fruits,was 79.5%to havest fruits.The recommended method was to spray at a dosage of 3150 g/hm^(2) on the early stage of fruit fly outbreak.The area of crown leaves which were about from 1.0 to 1.5 square metres were spraied,the fruits should be to avoid touching bait.The spraying should be done every 7 days until the end of harvesting.