الكثافة السكانية لحشرة المن على صنف العنب الأسود بطريقة العد المباشر

الملخص EN

The study was conducted field in terms of Yathrib , Balad , Salahuddin province , a class of black grapes to estimate the population density of aphids by using the method of counting direct plant parts upper and intermediate and lower , as were selected (40 plants ) at random from one of the fields have been counting the plant and only one showed results of the study that the highest population density was in the month of Maes was ( 22.8 ) adult / tree insect , and less population density was in the month of June was ( 9.7 ) extremely / tree insect , and statistical analysis showed significant differences , while the results showed that the upper layer of the plant were more susceptible to infection as the number of adult women ( 23.7 ) adult class upper , and ( 17.4 ) very in -class moderation , and ( 12.5 ) seriously in the bottom layer of the plant , and statistical analysis showed significant differences between the three layers of the plant