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Crop disease Some crop diseases show symptoms similar to those of phytotoxicity, such as mosaics and curls that occur when tomato virus disease occurs, leaf thickening and embrittlement that occur when peach leaf disease occurs, and leaf tip dryness is many Common symptoms of the disease.
Crop pests and crops will cause damage to the leaves (such as aphids), leaves chlorosis or redness (such as red spiders), and even cause leaves (such as wheat crops are seriously affected by wheat straw).
Lack of nutrients or excessive fertilization In general, crop nitrogen deficiency can cause yellow leaves and even dead spots. Excessive fertilization can cause burns in the leaves or dry leaves.
Environmental conditions Under the adverse environmental conditions, the use of pesticides is prone to phytotoxicity, but in the absence of pesticides, adverse environmental conditions can also cause similar phytotoxic damage to crops, such as freezing damage and high temperature can cause some crops to sprout, Damage to leaves and flowers; long-term drought can make crops grow poorly, plants become smaller and shorter, wilting, and leaf tips are necrotic; dry hot wind can cause some wheat varieties to have dry leaves; harmful gases can make plants yellow Plants are wilting or even whole plants die; irrigation with water containing harmful substances can cause crop growth to stagnate or even die; soil gas permeability is seriously bad, and it will also affect the normal growth of crops.
Author: Chen Maochun
Source: Sannong Online
In production practice, crops are often affected by a number of factors that may cause similar or identical symptoms to the phytotoxicity. In the identification of phytotoxicity, it must be carefully identified to prevent erroneous conclusions.
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