engleski

The efficiency of kaolin in the suppression of codling moth (Cydia pomonella L.)

Codling moth (Cydia pomonella L.) is one of the most important apple pests whose population is growing from year to year as same as the number of its treatments. The aim of this study was to determine the effectiveness of kaolin treatment in compareson with control treatment, applied on the basis of two different methods of time control (A- based on the catch on the pheromones ; B on the basis of biology and methods Wildbolz, 1965), on the three apple varieties (Melrose, Jonagored, and Golden Delicious clone B). The experiment was performed at the Agricultural Institute Osijek. The results of the efficiacy according to Abbott (1925) is ranged between 21.5 to 57%. Analysis of variance showed that the yield and damage on apples significantly differed between treatments in all three years of research. Influence of the different methods of determining control did not show statistically significant differences either in the domain of yield or damage except in one year testing when the level of significanse was 0, 5. The results of time control showed that using pheromone traps achieved equally good results as establishing the biology of codling moth in insect cage combined with monitoring developmental stages of pests using methods Wildbolz, 1962, so the assumption that the time of control on the basis of biology is more accurate and produces better results, can not be accepted. Combined analysis of variance showed the existence of highly significant differences between years, considering crop damage and the yield. On the basis of carried out research the control of codling moth in Eastern Croatia we conclude that the decision for controling could be made on the basis of pheromones monitoring and summarizing effective temperatures as codling mothʹs life stages depend on climate conditions and vary from year to year. Kaolin should be include in the treatment control programe because of its positive effect on the reduction of codling moths population.

codling mothe ; Cydia pomonella ; kaolin ; suppression time

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