Studies On Some Homopterous Insect Vectors Of Plant Diseases

ٍٍٍSurvey and seasonal abundance of certain homopterous insects (aphids, leafhoppers. planthoppers and whiteflies) infesting some graminaceous and leguminous (maize, wheat, cowpea, bean, broad bean, pea plants. Effect of certain climatic factors (maximum and minimum temperature and relative humidity) on the population density of the dominate homopterous insect infesting some graminaceous crop and leguminous plants. Effect of certain agricultural practices (varieties and fertilization) on the population density of the aforementioned insects. Effect of fertilization on the chemical contents of certain graminaceous and leguminous plant varieies and its relation with the population density of homopterous insects. Effect of fertilization on the hickness of plant epidermal.