Bioactivity of carvacrol on Panonychus citri McGregor and its safety to citrus growth
This study aims to evaluate the effectiveness of the new pesticide carvacrol on Panonychus citri McGregor,both indoors and in the field.The indoor bioactivity of carvacrol was evaluated using the slide-dip method and the field control effect was determined with the spray method.The effects of carvacrol on citrus growth were studied with different citrus varieties,including navel orange,oriental red pomelo,and chun mikan.After 48 hours of indoor treatment,carvacrol showed an LC50 of 5.78 mg/L and an LC90 of 30.64 mg/L in P.citri,indicating the toxicity of carvacrol was higher than that of abamectin.The field experiments showed that the control effect of 5％carvacrol AS at 62.5 mg/kg was between 76.84％to 89.47％within 1～20 days after the treatment,which was superior to that of 1.8％abamectin EC and 29％lime-sulfur AS treatment.5％carvacrol AS had a good effect on the control of P.citri with a lasting period of more than 20 days.
carvacrolPanonychus citri McGregorbotanical pesticideecological riskfield control effect
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