How to prevent and remedy pesticide damage in flowering plants?

I. Symptoms of pesticide damage in flowering plants

1. Acute pesticide damage. The damage occurs quickly and the symptoms are obvious, generally manifested as pitted spots, scorched spots or wilting on the leaves; spots, deformities, smaller fruit and fruit drop on the fruit; scorched and withered petals, flower drop and bud drop; stunted plant growth, and even death of the whole plant.

2. Chronic pesticide damage. The symptoms are not obvious and are hard to judge in a short time. It generally manifests as poor development, loss of gloss on the 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. Operate strictly in accordance with the requirements of the pesticide instructions, and do not use pesticides whose directions for use are unknown because the label has been lost. Do not arbitrarily increase the concentration and dosage. If the expected control effect cannot be achieved with the standard dosage and concentration, the pesticide variety should be changed.

2. Do not mix pesticides arbitrarily, so as to avoid causing pesticide damage.

III. First-aid measures for pesticide damage in flowering plants

1. Spraying water to rinse. If the wrong pesticide has been sprayed, immediately spray a large amount of clean water to rinse the plants; if the wrong soil treatment agent has been used, the method of alternating irrigation and drainage can be adopted to rescue them, and after washing out the pesticide, apply quick-acting fertilizer to promote the recovery of the affected plants.

2. Neutralization and mitigation method. If a mistake is made in the use of a pesticide and it is discovered fairly promptly, under the guidance of technical personnel, first wash with water and then use a pesticide of the opposite nature for neutralization, that is, when pesticide damage is caused by an acidic pesticide, it can be neutralized and resolved with an alkaline pesticide. For example, after pesticide damage occurs from the use of dimethoate emulsion, it can be neutralized with alkaline pesticides such as lime sulfur mixture and methomyl, so that the dimethoate decomposes, or it can be sprayed 1——2 times with a 200-fold borax solution to relieve it and restore the plants to normal.

3. Spraying remedy method. After broadleaf flowering plants have been 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 into a 500-fold solution, and poured onto the base of each plant, and after 3——5 days the leaves can gradually recover their function.

4. Fusion detoxification method. If pesticide damage occurs from spraying copper sulfate, a 5%——1% limewater solution can be sprayed for detoxification. For affected areas with missing plants, replanting can be done, and management should be strengthened.