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The Effect of Aldicarb On the Hatching of Heterodera Rostochiensis Larvae

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For more content, see Nematology.

Aldicarb (TemikR, UC-21149 or 2-methyl-2-(methylthio) proprionaldehyde O-(mcthylcarbamoyl) oxime) partially controls Helerodera rostochiensis Woll. (potato cyst eelworm) but its mode of action is not completely understood. Its systematic properties are well-known but there is conflicting evidence concerning the direct effect upon unhatched eggs and larvae within cysts. Evidence is given of a temporary inhibition of hatching induced by the presence of aldicarb in concentrations greater than 1 ppm. The ability to hatch is restored when cysts initially treated by aldicarb are removed to aldicarb-free root diffusate and the potential hatch is not seriously impaired, whereas the potential hatch in root diffusate of cysts initially treated by a mixture of aldicarb and root diffusate is considerably reduced. These effects tend to be greater at higher concentrations of aldicarb (5-20 ppm) and after longer periods of exposure (up to 12 weeks). The practical implications are discussed.

Affiliations: 1: Edinburgh School of Agriculture, West Mains Road, Edinburgh EH9 3JG, Scotland


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