بررسی کارایی کائولین فرآوری شده در کاهش جمعیت شپشک ستاره‌ای انجیر Ceroplastes rusci (Linnaeus)

Fig Wax Scale Ceroplastes rusci (Linnaeus) (Homoptera: Coccidae), is one of the key pests of fig cultivation, feeding on plant sap and causing economic damage to the product imports. FWS control is used by spraying pesticides in winter and spring. The application of these chemicals will cause a reduction in the density of natural enemies, and the application of new methods will be necessary for the least risk in the environment. A randomized complete block design experiment was carried out to evaluate and compare the efficiency of kaolin particle film with mainstream pesticides (acetamiprid, spirotetramat, and diazinon) used against FWS. The experiment was conducted in a fig orchard in Jolge Olia village, 21km north of the Poledokhtar region. The trees were sprayed with kaolin clay (Sepidan® WP) 5% & 7%, acetamiprid 250 g /1000 liters of water, diazinon 1 lit /1000 liters of water, spirotetramat 0.5 lit /1000 liters of water and water (control). Sampling from the trees was done one day before (as pretreatment counts) and on the 1st, 3rd, 7th, 14th, 21st, and 28th days after spraying application. As the results showed, there was a significant difference between the treatments at different times of the experiment. On the first and third days after the treatment, acetamiprid with a 79.26 and 77.94 percent reduction of the population, respectively, and diazinon with a 75.58 and 72.77 percent reduction of the population, respectively, had the highest efficiency. The mean percentage of FWS population reduction was observed in treatments including two different concentrations, 7 and 5%, of kaolin clay, spirotetramat, acetamiprid, diazinon, and control in 7 days after spraying, 69.62, 66.54, 47.41, 27.18, 26.89 and 4.25 percent, respectively, and also in 28 days after spraying, 96.84, 93.73, 67.33, 7.34, 5.88 and 3.69 percent, respectively. Therefore, kaolin (Sepidan® WP), with 7 and 5% concentrations, sprayed over the whole canopy of trees could be used successfully to reduce the wax scale population on fig trees.