4 optimization and control
4.1 go to early bud
According to the research, since the transgenic hybrid cotton is not fully developed in the early stage, it will be transferred to human reproductive growth, so it is not conducive to the establishment of an ideal population structure. In addition, the bells of the early knots were mainly some prunes. Since most of the bellflowers were metamorphosed into stamens in the rainy season, they contributed little to the yield, so the flower buds formed in the early stage of the transgenic hybrid cotton were removed. Not only can it effectively coordinate the vegetative and reproductive growth of the transgenic insect-resistant hybrid cotton, but it also reduces unnecessary nutrient waste. To early buds, the method of manual removal is mainly adopted, and the time is generally in the middle or late June. 4 to 8 buds were appropriate, of which 8 were the best and the parts were controlled within the lower 4 fruiting branches. When labor is insufficient, the lower 2 or 3 fruit branches can be removed instead of early buds, and similar results can be obtained. The results of early budding and contractile aminogenic control of transgenic cotton hybrids showed that the yield difference between early buds and early buds was 1%, indicating that the yield of transgenic hybrids was significantly higher than that of early buds. Effect; different amounts of reduced amines on the yield of transgenic hybrid cotton yield, in the initial flowering period and full flowering spraying carbon dioxide 22.5g/hm2 and 45g/hm2 respectively, the best yield increase; in the case of early buds Under the initial flowering period, spraying of dilute amine 225g/hm2 and full flowering period of 45g/hm2 were significantly higher than spraying fresh water, spraying 45g/hm2 at the initial flowering stage, and increasing 90g/hm2 at the flowering stage. In the absence of early buds, there was no significant difference in the two treatments of spraying with dilute amines, but there was a significant difference from spray water.
4.2 Chemical regulation
The test results showed that the spraying of dildoamine, the initial flowering stage dosage 22.5g/hm2, full flowering stage dosage 45g/hm2, compared to the initial flowering period using the Drosophila 30g/hm2, full flowering period using the dildodomamine 90g/hm2 respectively increased by 10.40%, 11.1%. According to the reproductive characteristics of transgenic insect-resistant hybrid cotton, in order to promote the transfer of growth center, attention should be paid to the chemical control measures before and after Shenglei. The amount of dilute amine can be slightly larger than that of conventional cotton varieties. Generally, it uses 2 to 3 times of total dilute amines. The dosage is 45-60g/hm2.
5 Reasonable pest control
The insect-resistance of transgenic insect resistant hybrid cotton is mainly resistant to Helicoverpa armigera, which can effectively reduce the occurrence and damage of Helicoverpa armigera, and it also shows good toxicity to many generations of Helicoverpa armigera larvae, especially young instar larvae. Tests have shown that the insect resistance of transgenic hybrid cotton has a certain relationship with the hybrid generation, F1 insect resistance is better than F2, F2 insect resistance is better than F3. Under normal circumstances, during the second generation of H. armigera, F1 basically can not use chemical control, and the death rate of budding bells can be controlled under 5%. In order to reduce the frequency of pest control in future generations of H. armigera, the number of prevention and control can generally be reduced (or 40% to 50 V% of the dose). The reduction in the number of pesticide control has protected natural enemies of pests, especially ladybugs, and has shown significant inhibitory effects on cotton fumes. The average insect-resistant effect of the transgenic hybrid cotton on the first-instar larvae of Helicoverpa armigera was 93.1%. The third-instar larvae were fed with leaves, buds and bells, and the insect-resistant effects were 90%, 85%, and 55%, respectively. In the coastal region of Jiangsu Province, the incidence of budding boll damage and the rate of affected plants in the second generation of cotton bollworms was generally 13-15 percentage points lower than that of conventional cotton varieties, indicating that transgenic hybrid cotton had good results. Insect resistance effect. The transgenic insect-resistant hybrid bollworm is resistant to lepidopteran pests such as red bollworm, corn borer, diamond borer, bridge-building insect, and leaf-roll insect. The second-generation bollworm may not be controlled. In the seedbed, dichlorvos are put into the ball or the enemies are poisoned to kill insects such as cotton aphids. At the seedling stage of Daejeon, it is only necessary to select the second-generation cotton-blinded warblers and red spiders and occasional pests in the cotton fields near the source fields. Cotton aphid is an extremely sensitive and very important factor that affects the ecological balance of insects in cotton fields. Therefore, aphids in nursery and transplanting cotton fields should not be listed as prevention objects, but should be used as food materials to cultivate many natural enemies. Therefore, before the occurrence of three generations of cotton bollworm, Large areas of cotton fields do not need universal drug control, only three or four generations of cotton bollworms and red spiders or three to four generations of cotton blind lycium in the year of priority prevention and control are used to control pests. Secondary pesticides can effectively control pests.
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