الفهرس | Only 14 pages are availabe for public view |
Abstract Wheat plants attack by cereal aphids species, S. avenae, R. padi, S. graminum, R. maidis and D. noxia, Empoasca spp., Nilaparvata lugens, L. cerealium, T. tabaci, Nezara viridula, Eysarcoris inconspicuous, leaf-miner, chromatomyia nigra, Sphyrotheca spp. and Silver Y moth, Phytometra gamma. The dominant predators with these insect pests were, C. undecimpunctata , Cydonia vicina isis, Cydonia vicina nilotica Mulsant, Scymyus sp., Rhyzobius litura, Paederus alfierii, chrysoperla carnea, Metasyrphus corollae and Orius sp. Abiotic factors especially temperature was the main requirement for integrated pest control (IPM), when it less than 36 ˚C was correlated positively with the most of wheat insects. While, when the temperature over 36 C˚ the cereal aphids disappeared. The relative humidity was correlated negatively with some of wheat insects. There are simple correlation between the main insect predators (Coccinella undecimpunctata, chrysoperla carnea and Metasyrphis corolla) and some wheat insect pests. Predator/ prey ratio on wheat insect pests was was an index to natural tolerance between insect pests and their predators and determined the optimum times of release of natural enemies or insecticidal application. where, the wide gap between the two group population were late March during the two seasons (142 and 71) prey to one predators, respectively, this time was the optimum to applied integrate control, whether, predators release or insecticidal. The wheat cultivars Sakha95, Sakha93, Sahka94, Giza168 and Geza171 were the lowest attacked by insect pests, which, accepts uses in integrated pest management program (IPM) as unfavorable to insect pests wheat hosts. Sowing dates specifies during Mid-November, was the recommended sowing date. The calculated EILs values were 6.56, 8.54, 7.08 and 5.96 in average of 7.03 aphid/ ear/ feddan, thus, seven individuals per spike was economic injury level of aphid specie S. avenae on wheat plant during flowering and heading stage. Mineral KZ oil decreased aphid population between 81.23% in first season and 66.41% in the second one, those percentages were a variable decrease percentage of aphid population, safe environment and enhanced natural enemies on this main human nutrition crop, specially, admit the harvest. |