Evaluation the efficiency of certain entomopathogenic fungi, chemical pesticides and their residual effects on Chrysoperla carnea larvae and two insect pests
Eman A Shehata, Naira S Elmasry
The toxicity effects of two commercial entomopathogenic fungi Biovar ((3200 viable spore/mg) andBio-Ranza, an ((32x106 viable spore/mg). Also, the toxicity effect of two chemical pesticides Renocam 48%EC (Chlorpyrifos-ethyl) and Match 5% E.C (lufenuron) were studied from 2 to 4 days under semi-field conditions against nymphs of the aphid, Aphis craccivora (Koch), the 2nd larval instars of the green lacewing, Chrysoperla carnea on bean leaves and against 2nd instar larvae of cotton leaf worm, Spodoptera littoralis (BOISD.) on cotton leaves under semi-field conditions. Different concentrations of the two entomopathogenic fungi, Renocam 48% EC and Match 5% EC were applied, LC50s and LC90s values were measured and tabulated. The chemical formulated pesticides, Renocam 48% EC gave highly efficient followed by Match 5% E.C. Biovar proved moderate toxic while Bio-Ranza ranked lest. The Mortality rate increased by increasing the concentration. The persistence of tested insecticides against the 2nd larval instars of the green lacewing, Chrysoperla carnea, Aphis craccivora (Koch) on bean leaves and against cotton leafworm (S.littoralis) on cotton leaves were measured after 1,3,6,9,12,15 and 21 days after application to evaluate the residual performances during the period from 1 August to 28 December, 2018 under semi -field conditions.