1. Pesticide types and phytotoxicity performance sensitive to plum
Plum blossoms are very sensitive to some pesticides, such as 40% dimethoate emulsifiable concentrate, which can cause the tip of the leaf to be burnt, the leaves appear dark spots, and the leaves are like the boiled water in a short time, all of which are lighted; 40% of omethoate emulsifiable concentrate, If it exceeds a certain concentration or is used under high temperature and strong light, it will cause yellow spots, dark spots or fallen leaves in the leaves; 80% of dichlorvos emulsifiable concentrates, above a certain concentration, or used in the young leaves, will cause the leaves to fall or fall. Fruit; 90% of trichlorfon crystals will also cause leaves; misuse of higher concentrations of monocrotophos may also cause the leaves of the plum plants to dry or fall off. The chlorothalonil for controlling diseases may cause defoliation; the use of Bordeaux mixture in the leafy stage will cause the tip of the young leaves to be scorched; the stone sulphur mixture may cause the tender shoots of the plum plants to fall or drop.
2. Methods for avoiding the occurrence of plum medicinal damage
1 artificial control
For example, artificially killing adults of P. sinensis, using the silk to kill the larvae of the beetles hidden in the branches and the wormholes; manually removing the bags of the bag moths and burning them intensively; manually scraping the worms of the yellow moth and the green moth Hey, crush it; manually remove the leaves infected with anthracnose and brown spot, concentrate on burning; manually scrape the lesions of the plaster, and then apply the Dakening cream.
2 trapping pests
For example, using the phototaxis of insect adults, hanging black light, frequency vibration lamps, etc., trapping adult moths, bag moths, etc.; hanging yellow traps to trap aphids.
3 biological pesticides
Such as the use of cotton bollworm nuclear polyhedrosis virus suspension agent to control bag moths, Bacillus thuringiensis Bt preparations and green worms to kill the larvae of the larvae; plant-derived pesticides, such as ginseng, azadirachtin, pyrethrum, borax preparations, etc. Pesticides kill moths, mites and so on.
4 reduce the concentration of medication
If the use of chlorpyrifos, malathion, omethoate and other pesticides to kill the scale insects, it must be reduced to below the normal use concentration, can avoid or reduce the occurrence of phytotoxicity.
5 avoid high temperature and strong light medication
Under the conditions of high temperature and strong light in summer, the pesticide should be sprayed after 5 o'clock. At this time, the effect of absorbing the liquid is good, and it is not easy to cause phytotoxicity.
6 Avoid using allergic pesticides
In the prevention of plum pests and diseases, it should be avoided to use pesticides such as dimethoate, omethoate, dichlorvos , trichlorfon, monocrotophos, carbofuran, sulphur mixture, Bordeaux mixture, chlorothalonil, etc. A pesticide that has the same insecticidal effect but does not cause phytotoxicity.
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