Anzeiger für Schädlingskunde, Pflanzenschutz, Umweltschutz (1999) 72, 76-80

J. Igrc, J. Barcic, R. Dobrincic and M. Maceljski (1999)
Effect of insecticides on the Colorado potato beetles resistant to OP, OC and P insecticides
Anzeiger für Schädlingskunde, Pflanzenschutz, Umweltschutz 72 (3), 76-80
Abstract: Starting in 1996, a three year test program was conducted. In 56 laboratory trials, the resistance of the Colorado potato beetle (CPB) to OP, OC and P insecticides was proven in almost the whole Croatia. In field trials , the stress was placed on testing the initial and residual efficacy on larvae, the effect of insecticides in preventing leaf damage and on establishing the relation between leaf damage and achieved yields. Imidacloprid showed a high initial and a very long residual efficacy, good leaf protection and high yields. Hexaflumuron had a slow initial but a very long residual action and ensured good leaf protection and high yields. Fipronil showed a good initial and residual action, good leaf protection and high yields. Spinosad, thiametoxam and lufenuron showed a satisfactory residual action, good leaf protection and high yields. Bensultap was highly efficient for only a short period but ensured low leaf damage and high yields. Thiacyclam was unsatisfactirily efficient. When total defoliation occurred at the begining of tuberization (1996) the yield was 8, 8 times higher on protected than on unprotected plots. When the total defoliation occurred shortly before the end of tuberization (1997) the yield was only 1, 4 times higher on protected than on unprotected plots. When 75% of defoliation occurred during an intensive tuberization process ( in 1998) the yield on protected was 2, 5 times higher than on unprotected plots, and when 25-40% defoliation occurred at the middle of tuberization process (1998 II and III) the yields were 1, 2 to 1, 3 times higher on protected than on unprotected plots.
(The abstract has been supplied by the author or ISPI and is excluded from the Creative Commons licence.)
Link to article at publishers website
Database assignments for author(s): Renata Bazok

Research topic(s) for pests/diseases/weeds:
pesticide resistance of pest
control - general

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Leptinotarsa decemlineata		Croatia