Influence of gypsy moth food on the biological efficacy of the tested insecticides
2012
Tabaković-Tošić, Mara (Institute of Forestry, Belgrade (Serbia)) | Koprivica, Miloš (Institute of Forestry, Belgrade (Serbia))
One of the steps on the path towards obtaining the permission for putting into circulation and for application of some insecticide is the study of the biological efficacy of it, i.e. of its ability to reduce a number of economically harmful insects to the normal level, which is considered to be safe. The study of the biological efficacy in forestry, by contrast to the same researches in agriculture, is faced up with many difficulties and problems, the biggest of which lies in the fact that in the natural conditions it is only possible to perform it when the outbreak of the target species occurs on a huge area of land. As a result, the study of the biological efficacy of the selected insecticide should be done simultaneously with the registration of it for this purpose and with the application in the suppression of the outbreak of the harmful insect. It is not possible to perform all of these activities simultaneously. The preliminary studies of biological efficacy are mainly conducted in the laboratory conditions, when the natural food of the gypsy moth larvae is not available, so prior to the experiment and during it the gypsy moth is fed on the synthetic food, specially adapted for the basic nutritional needs of this insect. Therefore, these studies are aimed at checking whether there are any statistically significant differences in the levels of the biological efficacy of the selected insecticides when they are applied on synthetic or natural food. In the experiments carried out in the semicontrolled laboratory conditions the levels of biological efficacy of some insecticides are mainly significantly different. In regard to the factor – type of food, i.e. nutrition by the natural or synthetic food, the maximum biological efficacy of all insecticides achieved when they applied on Pedunculate oak leaves can be explained by the tendency of larvae to prefer the natural food to the synthetic one, regardless of the fact whether it contains the feeding stimulators.
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