Assessment of infect intensity of Maize Leaf aphid insect   Rhopalosiphum maidis (Fitch) and it's control of chemicaly and biologicaly.

M. Khalf, J.; M. R. Mehaadi, H.; A. Mehaadi, H.

	Assessment of infect intensity of Maize Leaf aphid insect Rhopalosiphum maidis (Fitch) and it's control of chemicaly and biologicaly.
basrah journal of science
Article 1, Volume 28, Issue 1, 2010, Pages 21-28 PDF (0 K)
Authors
J. M. Khalf; H. M. R. Mehaadi; H. A. Mehaadi
Abstract
The role of different insecticides was differed in their effect on aphids insect biology, under labortary conditions(Temp. 25 ± 20C & R. H. 60%) Super acide insecticide had the remarkable effect, the mortality percentage reached to 90% after (24, 47 & 72) hours, followed by Actara insecticide the percentage of aphids mortality reached to (72.3, 81.1, & 90%), respectively for the time, the two mentioned insecticides differed than other in this study significantly. The numerical density of aphids insects on infected maize leaf was more than 100 insects per one sequare inch., The numbers of heavy infected leaves about 80 leaves from total numbers. The less numbers of survived individuates were (2.7 & 3) insects per one sequare inch., When Treated with Actara, while, reached to (13.7 & 10.3) insects per one sequare inch., When treated with Super acid after 1 & 3 days from spraying, respectively with high significant difference, in centrast with other insecticide treatments. The spores suspension of Trichoderma harzianum with conc. 106spores per ml had evident effect on aphid mortality which, led to highest percentage reached to 90% during 72 h. from treatment.

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