بررسی پراکنش و تراکم جمعیت نماتد گل‌آذین برانجیر Schistonchus caprifici (Gasparrini, 1864) Cobb, 1927 در ژنوتیپ‌های مختلف برانجیر استان فارس

Various reports indicate the presence and potential damage of the caprifig syconium nematode Schistonchus caprifici in the fig orchards of Fars province. In order to investigate the distribution, population density, and infestation of different genotypes of S. caprifici,, a total of 176 samples of profichi syconia of 43 genotypes of caprifig, were randomly collected in different regions of Estahban, Kavar, Khafr, Sarvestan and Shiraz in Fars province during 2022-2023 along with recording the geographical coordinates of the sampled locations. Extraction, identification and population density determination were done according to the routine procedure in nematology laboratories and distribution maps were prepared using ArcMap10 software. The infection percentage average, population density average and relative population density of caprifig syconium nematode were analyzed in different caprifig genotypes, using K-Nearest Neighbors (KNN) algorithm. The species of all extracted nematodes was identified as S. caprifici. The results of the analysis showed a significant difference between the genotypes of caprifig in terms of the infection percentage (MS=828.94, DF=42), population density average (MS=1213192.58, DF=42) and relative population density (MS=0.06, DF=42) indices. Out of 176 caprifig samples examined, 98% contained S. caprifici with different population levels. The infection percentage average of different caprifig genotypes with Schistonchus caprifici was 86.55±4.37. Population density average and relative population density of S. caprifici were 1478.19±387.15 and 0.823±0.04 nematodes in one gram of fruit tissue of the studied genotypes, respectively. The highest population density average and the relative population density of S. caprifici were observed as 11232 and 0.99 respectively in Kohisad genotype and the lowest as 0.5 and 0.01 in Nokghermezi genotype, respectively. According to the nematode population indices in the caprifig genotypes, it seems that infestation of caprifig syconium with S. caprifici can be effective in reducing the pollination efficiency of the pollinating wasps and also reducing the quantity and quality of edible figs and caprifig.