EFFECT OF THREE INSECTICIDES ON SOME BIOLOGICAL AND HISTOLOGICAL ASPECTS OF THE SPIDER ANELOSIMUS AULICUS (KOCH) | ||||
| Fayoum Journal of Agricultural Research and Development | ||||
| Article 3, Volume 30, Issue 2, July 2016, Page 37-52 PDF (970.37 K) | ||||
| Document Type: Research articles. | ||||
| DOI: 10.21608/fjard.2016.191746 | ||||
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| Authors | ||||
| N. M. El-Khouly1; A. A. Rahil1; E. F Dwidar2 | ||||
| 1Plant Protec. Depart. Fac. of Agric., Fayoum Univ. | ||||
| 2Botany Depart. Fac., of Agric., Fayoum Univ. | ||||
| Abstract | ||||
| The comb-footed spider, Anelosimus aulicus, has great potential to suppress insect pests of agricultural crops. The effect of some insecticides used against these pests on survival of this spider was investigated under laboratory conditions. Mortality and changes in the fine structure of the midgut 48h after treatment with Lannate®, Reldan® and Match® were examined. The LC50's, LC90's and slope of these insecticides were given. Lannate® was the most effective due to high acute toxicity, causing 66.7% mortality in females and 91.6% in males. It was also the most drastically effective on fecundity of females where no egg sacs were laid under the recommended field concentration (0.3gm/ 200 ml water). Reldan® caused 58.3% mortality in females and 83.33% in males. The least effective was in Match® causing 50% mortality in females and 58.33% in males. Obviously, males were more affected than females. The effect of insecticides on longevity periods and prey consumption of adults and, fecundity of females, at different concentrations of insecticides, were investigated. On the other hand, the histological study on the midgut glands of adults using Transmission Electron Microscope revealed similarity in structure of females and males of untreated spiders, whereas, treated spiders showed different changes indicated by the absence of some cells in the tissues in this organ, which might affect its digestive function and therefore ability for survival. | ||||
| Keywords | ||||
| Spiders; Anelosimus aulicus; Insecticides; MortalityTransmission Electron Microscope (TEM); Histology | ||||
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