Seasonal fluctuations of grape leafhopper, Arboridia kermanshah Dlabola, and its egg parasitism on nine grape cultivars in Isfahan

The grape leafhopper, Arboridia kermanshah Dlabola (Hemiptera, Cicadellidae), is one of the most economically important pests of most vineyards in Isfahan. Seasonal changes of the pest were determined on nine cultivars including White Yaghotii, Black Yaghotii, Askari, Rishbaba, Khalili, Rotabi, Red Keshmeshi, Black and White Keshmeshi in a randomized complete blocks design with split plots. In the present study, the highest density of adults and nymphs were observed in late May and June. Also, in the first decade of July, due to increased adult density, the egg density reached its highest level. The increase parasitism and cold weather in the late season leads to a reduction in the density of nymphs and adults, and ultimately the pest injury reached its lowest level at the end of the season. The results showed that the seasonal changes of the adults, nymphs and percentage of leaf injury had significant differences between grape cultivars. The highest population density of adults, nymphs and percentage of damage were observed on White Yaghotii. The lowest number of adults and damage percentage were recorded on Black Yaghotii, Red Keshmeshi, and White Keshmeshi. Considering differences in the population and injury of the pest on different grape cultivars, selection of suitable grape varieties can be helpful in the integrated pest management of A. Kermanshah.