季酮酸类新化合物HNPC-A9012的杀螨活性及田间防治效果

Bioactivity and control efficacy of a novel tetronic acid derivative HNPC-A9012 against Tetranychus cinnatarinus(Boisduval)

HNPC-A9012是由湖南化工研究院设计并合成出的具有杀螨活性的季酮酸类化合物。采用叶片浸渍法和玻片浸渍法测定了HNPC-A9012对朱砂叶螨Tetranychus cinnatarinus(Boisduval)成螨的毒力,采用叶片浸渍法测定了其对若螨和卵的毒力,并进行了盆栽药效试验、作物安全性试验及田间药效试验。结果表明:玻片浸渍法测得HNPC-A9012对朱砂叶螨成螨的LC50值为4.73 mg/L,叶片浸渍法测得其对朱砂叶螨卵、若螨和成螨的LC50值分别为10.91、1.95和3.82 mg/L。温室盆栽试验表明,20%HNPC-A9012悬浮剂在有效成分60和80 mg/L下,施药21 d后对朱砂叶螨的防效分别达81.64%和92.12%。陕西省的田间药效试验表明,20%HNPCA9012悬浮剂在有效成分45和60 g/hm2下,施药21 d后对朱砂叶螨的防效分别为92.59%和95.64%;河南省的田间防效总体偏低,但仍与对照药剂240 g/L螺螨酯悬浮剂和15%哒螨灵乳油同剂量处理的防效相当。此外,本研究还表明,20%HNPC-A9012悬浮剂在80、160、320 mg/L剂量下对供试作物安全。

HNPC-A9012 is a novel tetronic acid derivative developed by Hunan Research Institute of Chemical Industry. The toxicity of HNPC-A9012 against different growth stages of Tetranychus cinnatarinus （Boisduval） were tested in laboratory by dipping method. The control efficacy against T. cinnatarinus and safety to cotton seedling were also evaluated. The LC50 value of HNPC-A9012 against alduts of T. cinnatarinus was 4. 73 mg/L by slide-dip method, the LC50 value of HNPC-A9012 against eggs, nymphs and alduts of T. cinnatarinus were 10. 91, 1.95 and 3.82 mg/L respectively by leaf-dipping method. The control efficacy of 20% HNPC-A9012 SC against T. cinnatarinus in potted plant were 81.64% and 92. 12% at concentration of 60 and 80 mg/L, respectively, 21 days after treatment. The field control efficacy of 20% HNPC-A9012 SC against T. cinnatarinus in Shaanxi province were 92. 59% and 95.64% at the dosage of 45 and 60 g/hm2, respectively, 21 days after treatment. Though the field control efficacy of 20% HNPC-A9012 SC against T. cinnatarinus in He＇nan province was lower than that of Shaanxi province, it was similar to that of 240 g/L spirodiclofen SC and 15% pyridaben EC at the same dosage treatment. In addition, there was no crop injury observed at concentration of 80,160 and 320 mg/L.