مقالات رزومه مهندس حسن رحیمی

Web spider mites population playing a major pests on vegetable crops during hot summer months. Effectiveness three biomite doses (1, 1.5 and 2 ppm) on cucumber, muskmelon, watermelon in comparison effects of Neem-Azal 1.2% EC, Propargite 570EW, Abamectin 1.8% EC, 1.5 ml/l detergent liquid soap and water sprayed in controlled agent were evaluated against Tetranychus urticae in Esfahan, Khorasan Razavi and Kerman provinces respectively. Complete randomized block designed with three replications used and each replicate consisted at least 50 cultivated plants in each block. Treatment done when at least 5 mobile spider mite stages in 40% randomly collected leaves observed. By random collection of 30 leaves from each treatment determined, effects of them determined at one day before and 3, 7, 14 days after. Collected data converted into mortality% and mean mortality% analysis done with SAS software. Mean spider mite under leaf side of muskmelon in Khorasan Razavi observed 6 to 12 times and 3-5 times higher in Esfahan and Kerman respectively. Highest mean of 61.6 spider mites recorded under sider of muskmelon leaf for 2 ml/l of biomite treatment in Khorasan Razavi. Higher biomite doses effects recorded 73.46% for 2ml/l up to 7 days in Esfahan and 65.56% and 82.67% up to 14 days after recorded in Khorasan Razavi and Kerman without any phtyotoxicity on plant parts in all treatments. Spraying 2 ml/l of biomite at early morning hours under spider mite incidence, provided higher efficiency, longer toxicity period for controlling vegetable spider mites.

Effects bifenazate 24% SC doses (0.5 0.6, 0.7. ml/l) evaluated with spirodiclofen SC 240, fenazaquin  SC 20%, fenproximate 5% SC 5%, fenpropatrin, 10% FL on active stages of  Panonychus ulmi on red apple variety in East (Marand), West Azerbaijan (Oromia), Ardebil (Meshkeinshar) and Khorasan Razavi (Golmakan) provinces during 2010 . Blocked randomized design with three replications used and each replicate consisted four apple trees. Treatment done when mean of 5 mobile mite stages observed in 30% apple leaves collected randomly. Effects fo each treatment carried out by collection of 50 apples leaves and alive mite counted on upper leaf surface at one day before and 7, 14, 21 and 28 days accordingly. Mean active stages of P. ulmi mite/leaf found varied between 3.01 to 7.78 mites, 6.70 to 28.15mites, 3 to 36.66 mites and 17.43 to 26.83 mite among treatments in West Azerbaijan, Khorasan Razavi, East Azerbaijan and Ardebil respectively.  Highest mite mortality% threated by bifenazate doses up to 21 days after recorded 98.33% and 94.85% for 0.7 and 5 ml/l in Oromia and Golmakan, up to 14 and 7 days after observed 99.9% and 68.71% for 0.7 ml/l of bifenazate in  Marand and Meshkeinshar respectively. Bifenazate toxicity on mean of recorded natural enemies (predatory mites, Orius sp, and Thrips sp.) in Meshkeinshar reduced their number but did not eliminate them from apple trees. Higher doses of bifenazate application when mean of P. ulmi recorded lest than 5 mites on 30% of collected leaves, will provide effective control.