From mid-July to early September, the third and fourth generations of cotton bollworms are endangered. Due to the increase in the proportion of cotton fields and late development of this year, the second generation of H. armigera has a relatively large amount of debris, coupled with the prevalence of precipitation in July-August, and the resistance of insect-resistant cotton to the late growth stage is greatly reduced. According to the author's multi-year survey, the majority of spring cotton plants in the period from mid-July to early September have become ageing, the amount of eggs laid by the bollworm is relatively low, and the hatching rate is also relatively low, while the interplanting cotton mostly matures later and the cotton plants are younger. The tenderness was very favorable to the feeding of the bollworm, so the amount of eggs laid and the hatching rate of the eggs were 45.2% and 53.6% higher than that of the pure cotton field. Therefore, late-maturing cotton fields (most interplanting cotton fields and a few late-spring pure cotton fields) are the focus of the third and fourth generations of cotton bollworms.
Mastering the laws of egg movement
Grasp the rules of spawning and pay attention to the application site. Many bollworms produce eggs on the top of cotton plants, on the top leaves of fruiting branches, on buds and stalks. Therefore, the focus of application should also be on these sites.
Grasp the laws of incubation and pay attention to timely prevention and treatment. The hatching rule of the bollworm is: the head of the egg is white, yellow on the second day, black on the third day, hatch on the fourth day, and the growth point is damaged on the second day after the hatching of the eggs, and the migration damages the young buds on the fourth day. Therefore, the appropriate period of prevention and control should be after the hatching peak of the eggs, most eggs become black or before the migration does not migrate.
Grasp the law of feeding, pay attention to the application time. It has been observed that most of the bollworms are actively feeding at 8-11 and 15 o'clock, but rarely at high temperatures at 12-13 o'clock. Therefore, it is better to apply the drug at the time of its activity. Pay attention not to apply pesticide at high temperature, because the liquid is volatile and decompose at high temperature, which not only makes the operator poisoned, but also reduces the control effect. Do not apply the drug when there is dew in the morning, because the concentration of the liquid is diluted and the adhesion becomes poor. , Poor efficacy.
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