Effect of cucumber cultivar and vermicompost on melon aphid, Aphis gossypii Glover (Hom., Aphididae) in laboratory

مائده, محمدي گورجي and جبرائيل, رزمجو and كاظم, هاشمي¬مجد and مهدي, حسن¬پور (2009) Effect of cucumber cultivar and vermicompost on melon aphid, Aphis gossypii Glover (Hom., Aphididae) in laboratory. Masters thesis, University of Mohaghegh Ardabili.

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Abstract

In this study, the effects of vermicompost and cucumber cultivar (Cucumis sativus L.) were evaluated on population growth and Life table parameters of Aphis gossypii Glover. two cucumber cultivar (Royal and Storm) and five vermicompost:soil compounds: 0:100 (control), 10:90, 20:80, 30:70, 50:50% (V/V) were investigated in the first experiment. The plants were grown in a growth chamber at 25 ± 1ºC, 60 ± 5% RH and a photoperiod of 16 L: 8 D hours. The number of aphids was counted in 3, 5, 7, 9, 12, 15, 18, and 21 days after infestation of seedlings by aphids. In all vermicompost amended treatments, aphid numbers were lower than that of soil without any vermicompost. The highest and lowest aphid numbers occurred on Royal cultivar in control treatments and Storm cultivar at 30 and 50 % of vermicompost, respectively. In the second experiment, effect of cultivar and vermicompost were evaluated on the life table parameters of melon aphid in three compounds of vermicompost:soil compounds: 0:100, 20:80 and 30:70% (V/V). Based on our results the intrinsic rate of population growth in all of the vermicompost treatments on Storm cultivar was lower than that on Royal cultivar. the lowest net reproductive rate (R0) 8.56, (nymph/aphid generation) and intrinsic rate of increase (rm), 0.204 (aphid/aphid/day) occured in 30 vermicompost:soil treatment on Storm cultivar. Overall, the proportion of 30% vermicompost treatment seems to be a suitable compound for decreasing of the population of melon aphid

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