جستجوی مقالات مرتبط با کلیدواژه « granulocyte » در نشریات گروه « گیاهپزشکی »

The role of blood cells as the main components of the physiological defense of insects has been reported. Blood cells are the first factors of the circulatory system that participate in dealing with all kinds of stress and foreign factors. In the present study, four types of blood cells were identified in the hemolymph of the sugar beet weevil Lixus incanescens, which include prohemocytes, granulocytes, plasmatocytes and oenocytoids. Plasmotocytes were the largest hemocytes in terms of size, and the abundance of granulocytes and plasmotocytes in third (70 %) and fourth instar larvae (more 75 %) was higher than other cells. These findings are important as the first step in immunological studies of this insect.

The Mediterranean flour moth, Ephestia kuehniella Zeller, is one of the major pests in stored products worldwide. Several problems assossiated with the use of conventional insecticides have strongly demonstrated the need for applying alternative safe compounds such as insect growth regulators (IGRs). In the present study, growth regulating activity and hematological effects of pyriproxifen and methoxyfenozide were evaluated on E. kuehniella larvae. Effects of the insecticides were evaluated under laboratory conditions set at 26 ± 1 °C and 75% RH. Findings indicated that inhibition dose for fifty percent of population (ID50) was equal to 0.16 µg/mg larvae for pyriproxifen and 0.4 µg/mg larvae for methoxyfenozide, showing the considerable growth regulating effect on two-day-old fifth instar larvae. Then, influence of estimated doses were investigated on the insect hemocytes including total hemocyte count (THC) and differential hemocyte count (DHC). THC and the proportion of plasmatocytes were decreased as pyriproxifen doses increased, while, the granulocytes level was increased. In contrast, application of sublethal doses of methoxyfenozide caused a conciderable increase in THC and the plasmatocytes density, while, number of granulocytes was decreased. Since the total number of hemocytes and the proportion of plasmatocytes are very crucial in immune responses of insects, pyriproxifen could be used as an immunosuppressive pesticide in integrated control of E. kuehniella.