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A novel bioassay for evaluating insecticide sensitivity: a case study of Calocoris trivialis Costa (Hemiptera: Miridae) in olives
Ecotoxicology ( IF 2.7 ) Pub Date : 2021-02-24 , DOI: 10.1007/s10646-021-02357-x
Kiki Varikou , Nikos Garantonakis , Anastasios Malandrakis

A recent increase in the Calocoris trivialis populations associated with premature olive blossom dropping in Crete coupled with ineffective control by organophosphate and pyrethroid insecticides resulted in resistance development speculation. A stem-dip assay was developed to evaluate C. trivialis susceptibility to dimethoate and beta-cyfluthrin against nymphal and adult insect stages. Susceptibility of C. trivialis populations collected from two Cretan orchards with no (AGRK) and extensive spray history (SPL) to both insecticides was evaluated and compared. Dimethoate LC50 values of the AGRK population were 17.47 and 33.37 mg L−1 for adults and nymphs and 45.85 and 20.08 mg L−1 for SPL respectively. C. trivialis was significantly more susceptible to beta-cyfluthrin as indicated by LC50 values for AGRK, SPL adults (0.53, 0.73 mg L−1) and nypmphs (1.44, 2.21 mg L−1). No evidence for resistance development was found in any of the insecticide cases. Adult insects were significantly more sensitive than nymphs in both insecticide/population combinations. Ratios of nymph: adult LC50values were 1.91, 2.71 for dimethoate and beta-cyfluthrin in AGRK and 2.28, 3.02 in SPL population. Susceptibility data and evidence of differential stage-dependent response of C. trivialis to both insecticides should be taken account for the establishment of effective control strategies.



中文翻译:

一种用于评估杀虫剂敏感性的新型生物测定方法:以橄榄中的Calocoris trivialis Costa(Hemiptera:Miridae)为例

最近,由于克里特岛上的橄榄过早落花引起的琐碎杯藻种群增加,再加上有机磷酸盐和拟除虫菊酯类杀虫剂的无效控制,导致了抗药性的发展推测。开发了茎浸试验以评估小球藻对乐果和成虫阶段对乐果和β-氟氰菊酯的敏感性。的敏感性C. trivialis从两个克里特果园收集无(AGRK)群体和广泛喷雾历史(SPL)两者杀虫剂进行评价和比较。对于成年人和若虫,AGRK人群的乐果LC 50值分别为17.47和33.37 mg L -1和45.85和20.08 mg L -1分别用于SPL。C. trivialis通过LC指示是β-氟氯氰菊酯显著更易感50为AGRK值,SPL成年人(0.53,0.73毫克的L -1)和nypmphs(1.44,2.21毫克的L -1)。在任何杀虫剂病例中均未发现产生抗药性的证据。在杀虫剂/种群组合中,成虫比若虫明显更敏感。若虫的比率:成年果蝇的LC 50值在AGRK中为乐果和β-氟氰菊酯为1.91、2.71,在SPL人群中为2.28、3.02。易感数据和琐碎梭状芽孢杆菌不同阶段依赖性反应的证据 对两种杀虫剂都应考虑建立有效的防治策略。

更新日期:2021-02-24
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