The genetic character of conventional insect-resistant cotton is relatively stable, and it can be planted continuously for 2 to 3 generations. Generally, about 70 kg of lint is produced per mu, and the cultivation measures are basically the same as those of common cotton varieties. Hybrid insect-resistant cotton is a type of cotton that has been developed through the use of two parents for crossbreeding. One of the two parents is an insect-resistant cotton variety. It not only possesses anti-insect properties, but also exhibits strong hybridization advantages. The hybridization advantage of hybrid insect-resistant cotton is limited to the hybrid generation, and the gene recombination phenomenon will occur in the second generation of hybrids, which will greatly reduce the yield. Therefore, the second generation of hybrid insect-resistant cotton cannot be used as seeds. Whether it is conventional insect-resistant cotton or hybrid insect-resistant cotton, it is not resistant to all pests. They are only resistant to young larvae of lepidopteran insects such as cotton bollworm and corn borer, but not to cotton locusts, spider mites and other cotton fields. Other pests. Therefore, when planting insect-resistant cotton, the first and second generation bollworms may not be controlled. When insect-resistant cotton enters the middle and late growth stage, the concentration of toxic protein in the plant becomes lower, and the resistance is relatively weakened. Therefore, the third and fourth generations of cotton bollworm should be timely controlled in combination with field investigations. When the insect-resistant cotton field is found to have three instars per 100 strains. When more than 3 instars and 20 bollworms are used, comprehensive control measures should be taken in time.
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