CORN PREPARED BY Zholekeeva M Ergara G APPROVED

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CORN PREPARED BY: Zholekeeva M. Ergara G. APPROVED BY: Musayeva M.

Plan ● Corn(plant) ● Pests Plant

● Corn (lat Zea. ) - A genus of plants of the family Poaceae (Poaceae), including six species [2]. However, in the culture of the genus is represented by the only species Zea mays, cultivated worldwide on an industrial scale and is an important food, feed and industrial crop.

● Stem borer (Pyraustanubilalis. Hb. ) Belongs to the family ognevok {Pyralididae), it is a dangerous and widespread pest of maize, millet and hemp. Plants caterpillar damage up to 25 mm, a yellow-gray; on the back runs a dark stripe, and each segment has four black panel; head, cervical and anal scutes brown; false leg with a rubber sole, hooks on it form an almost closed ring, and they are the longest in the middle of the ring. Age caterpillars are distinguished by the head capsule width: 1 st age - 0. 32 mm, 2 nd - 0. 53 3 rd - 0. 78 4 th - 1. 15 and 5 th 1. 43 mm. In the forest-steppe and steppe regions of Ukraine intensive breeding occurs in areas where hydrothermal coefficient for the period from 15 May to 10 July is 1. 2 -1. 8. Adult caterpillars overwinter inside krupnostebelnyh crops and weeds. Flight of butterflies occur in the southern area in the middle, and in steppe - at the end of June. After 4 -5 days after

● The chemical method of struggle. The primary chemical method to control pest populations is a pre-sowing seed disinfectant Gaucho with. n The rate of flow of the drug -. 5 -6 kg / tonne of seeds. To destroy the caterpillars applied twice chemical processing sweet corn drugs Decis 2. 5% to. E. (0. 50. 7 l / ha), Shtefesin 2. 5, r. E. (0. 5 -0. 7 l / ha): the first - at the beginning of hatching caterpillars, the other - at the mass of their appearance.

● Cotton bollworm much damage corn. Butterflies lay their eggs on all parts of the plant. Hatched caterpillars damage Pochatkova thread or panicles, and adult penetrate the wrapper and gnaw grains at the tip of the cob, and can gnaw moves to its very foundation, filling their excrement. In Ukraine, the cotton bollworm hurting everywhere, causing damage to crops as a spring and summer sowing dates. Combat cotton bollworm, which can be reserved on crops of sweet corn, should be given special attention in the general system of measures to combat pests of this crop.

● ● Control measures. In the fight against winter moth are important agro-technical measures. To limit the spread of cotton bollworm used optimally early sowing, which make it possible to avoid the development of larvae 5 -6 th stages of development up to technical maturity cobs phase. Biological control. Against cotton bollworm efficient use of Trichogramma. . At a rate of 50 thousand individuals entomophage / ha release is carried out in two periods: at the beginning of egglaying and during the laying of the mass. When the double release of Trichogramma egg cotton

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