Effect of Intercropping of Certain winter Crop Plants on the Population Levels of Jasmine Whitefly Aleuroclava jasmini (Hemiptera:Aleyrodidae) in Dezful's Citrus Orchards

In recent years Jasmine whitefly Aleuroclava jasmini(Takahashi,1932), has caused severe damage to the citrus orchards of Khuzestan province. In order to evaluate the effect of intercropping on population of Jasmine whitefly, a field trial (T1) with six treatments include four treatments intercropping of Broad beans (Vicia faba L.), Common bean (Phaseolus vulgaris L.), White clover (Trifolium repens L.) and Cucumber (Cucumis sativus L.), and two treatments control of without weeds (C1) and with weeds (C2) in an orchard of Valencia oranges in a completely randomized design with five replications was carried out from September 2013 until July 2014. Each plot consisted of 20 trees that five trees per plot (five repetitions) were selected and 12 leaf samples were taken randomly from each tree. The results showed that in six times sampling in spring, among intercropping treatments, the whitefly's egg and nymph population had significant differences in the levels of 0.05 and 0.01, respectively. The minimum egg population was in the treatments of C1=13.88±0/12( statistical group b), cucumbers 17.82±0/06( statistical group ab), and Broad beans 19.14±0/06( statistical group ab) which had significant differences with other treatments. The minimum nymph population was in the treatments of C1=6.5±0/07(statistical group d), Broad beans 9.21±0/08( statistical group c), and cucumber 10.13±0/07(statistical group bc) which had significant differences with other treatments.