What to Do About Herbicide and Pesticide Damage to Flowering Plants? A Full Guide to Prevention and Rescue Methods

I. Symptoms of Pesticide Damage in Flowering Plants

1. Acute pesticide damage. The damage occurs quickly and the symptoms are obvious, usually appearing as spots, scorched patches or withering on the leaves; fruit develops spots, becomes deformed, shrinks and drops; petals scorch and wither, flowers and buds drop; plant growth slows, and in severe cases the whole plant dies.

2. Chronic pesticide damage. The symptoms are not obvious and are hard to identify in a short time. They usually appear as poor development, dull leaves, delayed flowering, small and few flowers, faded flower color, and easy dropping of flowers and fruit, very similar to the symptoms of nutrient deficiency.

II. Prevention of Pesticide Damage in Flowering Plants

1. Use pesticides according to the instructions. Strictly follow the requirements in the product instructions, and do not use pesticides whose directions are unknown because the label has been lost. Do not arbitrarily increase the concentration or dose. If the standard dose and concentration cannot achieve the expected control effect, then switch to a different pesticide product.

2. Do not mix pesticides at will, to avoid causing pesticide damage.

III. First-Aid Methods for Pesticide Damage in Flowering Plants

1. Spraying and washing method. If the wrong pesticide was sprayed, immediately spray large amounts of clean water to rinse the plant; if the wrong soil-treatment chemical was used, rescue it by alternating irrigation and drainage, and after washing out the chemical apply a quick-acting fertilizer to help the affected plant regain vigor.

2. Neutralization and relief method. If a mistake is made in applying a pesticide and it is discovered fairly promptly, under the guidance of technical personnel, first wash with water and then neutralize with a pesticide of the opposite nature; that is, pesticide damage caused by an acidic pesticide can be neutralized and resolved with an alkaline pesticide. For example, after pesticide damage from dimethoate emulsion, alkaline pesticides such as lime sulfur mixture and methomyl can be used to neutralize it, causing the dimethoate to decompose, or a 200-fold borax solution can be sprayed 1-2 times to relieve it and restore the plant to normal.

3. Spray remedy method. After broadleaf flowering plants are mistakenly treated with the herbicide MCPA, the leaves are damaged and turn white; 50% sodium humate granules can be used, first dissolved in a small amount of water, then diluted with water to a 500-fold solution, and poured over the base of each plant, and after 3-5 days the leaves can gradually recover their function.

4. Blending and detoxifying method. If pesticide damage occurs from spraying copper sulfate, lime water at a concentration of 5%-1% can be sprayed to detoxify. For affected gaps where plants are missing, replant and strengthen management.