Resistance of Aphis fabae and Myzus persicae to insecticides in sugarbeet
2000
Ioannidis, P.M. (Hellenic Sugar Industry, Platy Imathias (Greece). Plant protection Dept.)
Aphis fabae and Myzus persicae become a problem during some years in certain areas of Greece in sugar beet and sometimes control failures occured. Laboratory bioassays were conducted to determine the levels of resistance to various insecticides (methamidophos, imidacloprid, pirimicarb, lamda cyhalothrin and carbosulfan). LD50's were estimated by using the dip test method recommended by FAO, with assessment of mortality at 24 hours. The tested populations were collected from various fields of different areas. The results showed that some resistance of Aphis fabae to pirimicarb and high resistance to methamidophos has been developed. These two insecticides have been used extensively for a long period to control the aphids on sugar beet as well as on other crops. Carbosulfan was very effective to Aphis fabae with a mean LD50 of 0.8 ppm. On the contrary Myzus persicae was very resistant, almost immune, to pirimicarb and carbosulfan. Both the tested species, collected from sugar beet were susceptible to imidacloprid, with few populations of Myzus persicae tolerant to imidacloprid. Monitoring for resistance to insecticides is necessary for early detection of resistance problems, in order to use the proper insecticide or other suitable control method under the design of an integrated pest management system, for successful resistance management.
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