Which parts need attention when spraying cotton?

Practice has shown that for cotton to yield well, management is key. In the growth and management of cotton, spraying pesticide is an important part of that management. The pests that commonly occur on cotton include: aphids, red spider mites, mirids (plant bugs), pink bollworms, cotton bollworms, diamondback moths, and so on. These pests lay eggs and cause damage in different places, so when spraying you must pay attention to the location.

During the cotton seedling stage, aphids, red spider mites and others cause damage on the underside of the cotton leaves, so when spraying pesticide, the spray solution must be applied to the underside of the leaves. The pink bollworm that occurs in the middle and late stages of cotton lays eggs on tender tips, tender stems and the underside of tender leaves; after bolls form, most eggs are laid between the young sepals and the boll shell, and the larvae enter the young bolls to cause damage. Cotton bollworm eggs are laid on the upper surface of cotton leaves, and the larvae bite and feed on buds, flowers and bolls. Mirid eggs are laid inside the leaves, and the young nymphs pierce and suck the sap of tender leaves and small buds and bolls.

To control pink bollworm, the spray solution must be applied to the green bolls on the lower part; to control cotton bollworm, the spray solution must be applied evenly to the upper surface and tender tips, as well as the stems, leaves and buds and bolls; mirids are highly active, so the spray solution must be applied to the upper surface of the leaves, the tender parts, the stems and the bolls.

Cotton farmers, please note: when spraying cotton, you must protect the flowers and bolls. Cotton usually blooms in the morning; if you spray at this time, it is easy for the pollen grains to absorb water, swell and rupture, affecting normal pollination. If you spray after 4 p.m., the pollination process is basically finished, so spraying at this time has less effect.