بررسی الگوی توزیع و تغییرات جمعیت زنجرک های ناقل بیماری صکرلی تاپ در مزارع چغندرقند

Based on the data obtained from a three-years field sampling, during 2007 to 2009, the spatial distribution pattern, the trend of population fluctuation of the leafhopper Circulifer haematocep, the vector of sugar beet curly top disease and the correlation between the curly top incidence and the population frequencies of the vector, in the sugar beet growing areas of Hamedan province of Iran, were determined. The samplings were carried out at the early stages of sugar beet growth. According to Fisher, et el (1985), the insect sweep net was selected as sampling unit. In order to determine the suitable size of the samples, a preliminary sampling was performed and the RV factors for the three evaluating years were, 12.2%, 6.52% and 16.65%, respectively. Statistical analysis of the data of the C. haematoceps populations for each individual year and the compound analysis of the data for the three years studies was done using the ratio of variance to mean (S2/m). The results showed that the spatial distribution of the vector population was cumulative. It was found that the population ratio of the species C. haematoceps to the total species of leafhoppers in 2007, 2008 and 2009 were 5.68%, 1.97% and 2.43%, respectively. The means of curly top infected sugar beet plants in the three years were 5.2%, 8.6% and 5%, respectively. The rate of curly top infected sugar beet plants was the highest (8.6%) in 2008 in which the earliest sugar beet planting date was also occurred. The correlation coefficient (R2) for the three years studies were 0.96%, 0.90% and 0.94%, respectively indicating the existence of a strong correlation between the curly top occurrence and the vector population in the field.

Keywords:

سیرکولیفر , زنجرگان , چغندرقند , پویایی جمعیت , بیماری زاها