Spot lesions are generally irregularly distributed on plants, and their sizes and shapes are inconsistent. Mainly in the leaves, with yellow spots, brown spots, dead spots, etc., such as paraquat applied on rice to cause brown spots; sometimes expressed on stems, such as rice quizalofop-Pharm, sometimes on fruit, such as Azoxystrobin causes spots on apple fruit.
Yellowing and yellowing can occur in the stems and leaves of plants, and more yellowing occurs in leaves, mainly because pesticides hinder the normal photosynthesis of chlorophyll. The occurrence of mild yellowing of the leaves, the occurrence of heavy yellow flowers showed that the whole plant yellow, and finally from the yellow leaves into dead leaves. The performance is often closely related to the weather conditions, and there are many sunny days. The yellowing produces fast, the rainy days are much, and the yellowing produces slowly. This should be differentiated from the yellowing caused by the lack of elements and diseases. The most common is yellowing of leaves caused by herbicides that contain isophospine.
The common malformations include leaf curling, clustering, root swelling, malformed ear, and deformed fruit. For example, when the wheat seed buds are harmed by dimethyltetrachlorobenzene, the bases of the buds and the roots of the young roots are swollen. When the cotton seedlings are harmed by the herbicide ether, the growing point is atrophied, and the cotton leaves are blister-shaped. Tomatoes are sprayed with high concentrations of sodium tetracycline and leaf rolling occurs. Tomatoes suffering from 2.4-D injury appear hollow fruit, malformed fruit.
Plant wilt caused by withered phytotoxicity usually has no disease center, and most of the processes occur slowly, and the yellowing and the dead plant are followed, and the rhizome-transmitting tissue has no browning, which is mainly caused by herbicides. For example, watermelon seedlings were damaged by chlorotoluron, yellow leaves appeared in the leaves, coked leaves on the leaf margins, and atrophy of the plants; coking, wilting, and dead seedlings appeared when the pesticides were sprayed with high concentrations of the pesticides; corn was yellow and withered due to the occurrence of herbicides. ; rice seedlings misuse the grass cover, the whole plant will wither and die.
Inhibition of Growth Inhibition of growth caused by phytotoxicity is often accompanied by plaque or other phytotoxicity symptoms, which are mainly caused by improper application of growth inhibitors and herbicides. If the amount of chlormequat is too large, the growth of the crops will be stagnated. The improper application of chlorotoluene in rapeseed will cause the growth retardation and the reduction of branches. Paclobutrazol may be used for late planting of poplar fields, which will make the seedlings grow slowly and affect the normal heading.
Shedding on fruit trees and other dicotyledonous plants often occurs with falling flowers, fallen leaves, and fruit drop. For example, if peach is used for water amifosphos, omethoate is applied during flowering to cause defoliation, or leaves are affected by copper preparations; the use of methamidophos in pear trees causes flowering; and improper use of ethephon in hawthorn causes fruit drop and defoliation.
The appearance of phytotoxicity in the fruit of a bad fruit sometimes manifests as an abnormality in the fruit surface and deteriorates the quality. If the watermelon suffers from ethylene toxicity, the melon bud is dark red and has an odor; the watermelon swelling agent is not suitable for causing cracking.
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