What are the common crop drug hazards?

Pesticides not only play a very important role in agricultural production, but also bring more or less adverse effects to crops. If this adverse effect is aggravated, it will lead to abnormal reactions of crops, resulting in yield reduction and quality decline, that is, drug damage. There are some mild and severe drug injuries, some urgent and some mild, and the symptoms can be summarized as follows:

Spot

This kind of drug damage is mainly manifested in leaves, such as macula, brown spot, withered spot and so on. If butachlor is applied in the early stage of rice Honda to cause brown spot, the high concentration of mancozeb will cause rice leaf edge withered spot. Sometimes spots are also shown on stems, branches and fruits, such as pear fruit when mancozeb is applied, it is easy to appear fruit spots.

Etiolation

The reason for yellowing is that pesticides hinder the synthesis of chlorophyll, or block the photosynthesis of chlorophyll, or destroy chlorophyll, such as the yellowing of new shoots caused by the application of Sumidin on watermelon, and the yellowing of benzenesulfuron, which is suitable for wheat fields, to other crops, and so on.

Deformity

This kind of drug damage can occur in all organs of plants. The common deformities include curly leaves, clumps, swollen roots, deformed ears and malformed fruits, such as curly leaves when tomato is sprayed with high concentration of naphthylacetic acid, hollow fruits and malformed fruits caused by improper application of 2mai D, fan-shaped leaves of melons damaged by 2mem4murd, and low purity triacontanol is easy to make tomato tender leaves curl and so on.

Withered

This kind of drug damage is generally the whole plant performance, mainly due to herbicide damage, such as watermelon seedlings caused by chlorotoluron, young leaves yellowing, leaf margin withered, plant atrophy; legumes spraying high concentration of insecticides appear scorch, wilting, dead seedlings and other drug damage.

Growth stagnation

The drug damage caused by improper application of growth inhibitors and herbicides, such as excessive use of dwarftin, leads to crop growth stagnation.

Infertility

The cause of this kind of drug damage is the improper use of drugs at flowering stage, such as the empty chaff grains will be caused by the application of rice foot clear during rice heading.

Fall off

It often occurs in fruit trees and other dicotyledonous plants, such as flower drop, leaf drop, fruit drop and so on, such as peach trees with isocarbophos and omethoate at flowering stage, or under the influence of copper preparation; pear trees with methamidophos cause flower drop; Hawthorn application of ethephon improperly causes fruit drop and leaf drop.

Bad fruit

The appearance of drug damage to the fruit is sometimes characterized by abnormal fruit surface and poor quality, such as watermelon damaged by ethephon, dark red flesh and peculiar smell.