The Effect of photo degradation on the biological activity of dursban in controlling of aphids ( Myzus persicae ) on Cucumber ( Cucumis sativus L. ) .

Abstract

Several experiments were conducted at AL-Ramadi distinct / AL-Anbar province, Iraq in 2005 to investigate effect of photo degradation on the biological activity of dursban in controlling of aphids (Myzus persicae) on cucumber. The insecticide was exposed to three different wave lengths in the laboratory (253.7, 365 and 623.5 nm) for different periods of time (1, 2, 4, 6 and 8 h) before field application in infestation % of aphids and productivity of cucumber were estimated. Results showed that dursban activity was decreased at low wave lengths treatment, whereas infestation % was (20 and 22 %) at (253.7, 365 nm) treatments respectively. While it was (13 %) under (623.5 nm), decreased productivity of plant with decreasing wave lengths, was also recorded the average yield was 2899 and 2944 kg/D) recorded for (253.7,365 nm) wave lengths respectively, compared to (3138 kg/D) obtained to ( 623.5 nm ) treatment.