جستجوی مقالات مرتبط با کلیدواژه "panonychus ulmi" در نشریات گروه "گیاهپزشکی"

European red mite Panonychus ulmi (Koch) is one of the most important pests in orchards including apple trees, across different parts of Iran. The effectiveness of the new acaricide acequinocyl was tested on the European red mite of apple tree in three provinces of West Azerbaijan, East Azerbaijan and Khorasan-e Razavi in 2016. Effect of acequinocyl 1 and 1.25 ml/lit was compared with spirodiclofen 0.5 ml/lit, phenazaquin 0.5 ml/lit, and control (watering). In order to determine the effectiveness of the treatment, the number of live mites on host leaves was recorded at one day before and 3, 7, 14 and 21 days after spraying. The percentage of efficiency of these treatments was calculated using Henderson-Tilton formula and the Analysis of Variance was done with SAS statistical software. In West Azerbaijan, there was a significant difference between treatments at 3 and 7 days and acequinocyl 1.25 ml/lit and phenazaquin were most effective in 3 days (97%). In East Azerbaijan, at 3 days, all acaricides showed more than 73% effectiveness. On the 21st day after spraying, spirodiclofen and acequinocyl (1 ml/lit.) had the highest effect compared to the other treatments (75.27% and 65.07% respectively). In Khorasan-e Razavi, all treatments were more than 93% effective at 14 days and the effect of acequinocyl 1.25 ml/l and phenazaquin treatments were similar (100%) on day 3. The results showed that acequinocyl at the both concentrations (1 ml/lit and 1.25 ml/lit) was effective in controlling European red mite on apple and could be a good alternative to older acaricides.

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.