Effectiveness of spinosad against seven major storedgrain insects on corn

FANGNENG HUANG; BHADRIRAJU SUBRAMANYAM

摘要

In January 2005, the United States Environmental Protection Agency registered spinosad as a stored grain protectant. No referenced data on the efficacy of spinosad on corn in suppressing major stored-grain insects have been published. In this paper, we evaluated the efficacy of spinosad against seven major stored-grain insects on shelled corn in the laboratory. Insect species tested were the red flour beetle, Tribolium castaneum (Jacquelin duVal); rusty grain beetle, Cryptolestes ferrugineus (Stephens); lesser grain borer, Rhyzopertha dominica (F.); sawtoothed grain beetle, Oryzaephilus surinamensis (L.); rice weevil, Sitophilus oryzae (L.); maize weevil, Sitophilus zeamais (Motschulsky); and Indian meal moth, Plodia interpunctella (Hübner). Corn kernels were treated with spinosad at 0,0.1, 0.5, 1, and 2 active ingredient (a.i.) mg/kg for controlling the seven species. Beetle adults or P.interpunctella eggs were introduced into each container holding 100 g of untreated or insecticide-treated corn. The seven insect species survived well on the control treatment, produced 28 to 336 progeny, and caused significant kernel damage after 49 days. On spinosad-treated corn, adult mortality of C. ferrugineus, R. dominica, O. surinamensis, S. oryzae, and S. zeamais was ＞ 98% at 1 and 2 mg/kg after 12 days. Spinosad at ＞ 0.5 mg/kg completely suppressed egg-to-larval survival after 21 days and egg-to-adult emergence of P. interpunctella after 49 days, whereas 16% T. castaneum adults survived at 1 mg/kg after 12 days. Spinosad at 1 or 2 mg/kg provided complete or near complete suppression of progeny production and kernel damage of all species after 49 days. Our results indicate that spinosad at the current labeled rate of 1 mg/kg is effective against the seven stored-grain insect pests on corn.

机译：2005年1月，美国环境保护署将多杀菌素注册为储存的谷物保护剂。尚未发表有关多杀菌素对玉米抑制主要储粮昆虫的功效的参考数据。在本文中，我们在实验室中评估了多杀菌素对带壳玉米上的7种主要储粮昆虫的功效。测试的昆虫种类是红色面粉甲虫Tribolium castaneum（Jacquelin duVal）。生锈的甲虫，Cryptolestes ferrugineus（Stephens）;小grain虫，Rhyzopertha dominica（F.）;锯齿状甲虫，Oryzaephilus surinamensis（L.）;稻象鼻虫，Sitophilus oryzae（L.）;玉米象鼻虫，Sitophilus zeamais（Motschulsky）;和印度菜蛾，Plodia interpunctella（Hübner）。用甜菊酯以0,0.1、0.5、1和2活性成分（a.i.）mg / kg的剂量处理玉米粒，以控制这七个物种。将甲虫成虫或间点假单胞菌卵放入装有100 g未经处理或经过杀虫剂处理的玉米的每个容器中。这七个昆虫物种在对照处理中存活良好，产生了28至336个子代，并在49天后造成了明显的籽粒损害。在经过多杀菌素处理的玉米上，第12天后1和2 mg / kg时，C。ferrugineus，R。dominica，O。surinamensis，S。oryzae和S. zeamais的成年死亡率＞ 98％。大于0.5 mg / kg的Spinosad在21天后完全抑制了卵到幼虫的存活，在49天后完全抑制了穿刺假单胞菌的卵到成人的出现，而16％的锥栗木成虫在12天后的存活率为1 mg / kg。 1或2 mg / kg的多杀菌素可在49天后完全或几乎完全抑制所有物种的子代产量和籽粒损害。我们的结果表明，以目前标示的1 mg / kg剂量的多杀菌素对玉米上的7种储粮害虫有效。

Effectiveness of spinosad against seven major storedgrain insects on corn

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