How to distinguish between phytotoxicity and disease?

(1) The difference between spotted phytotoxicity and physiological disease

The distribution of spotted phytotoxicity on plants is often irregular, and the whole field is also light and heavy. Physiological diseases usually occur, and the symptoms of plants appear more consistent. Spot-type phytotoxicity and fungal phytotoxicity are also different. The former has a large change in the size and shape of the spot; the latter has a center of disease, and the shape of the spot is relatively uniform.

(2) The difference between yellowing-type phytotoxicity and deficiency of yellowing

The yellowing caused by phytotoxicity often develops into dead leaves from yellow leaves, with plenty of sunny weather and rapid yellowing; lack of yellowing of nutrients, more rainy days, slower yellowing, and yellowing often with soil fertility and fertilization The level is related and the performance is consistent in the whole field. Compared with the yellowing caused by the virus, the latter yellow leaves often have broken green and strong performance, and the diseased plants show systemic diseases, and the diseased plants are mixed with healthy plants.

(3) The difference between malformed phytotoxicity and viral disease deformity

Malformations caused by phytotoxicity are common, and local symptoms are manifested on plants; malformations caused by viral diseases are often sporadic, often accompanied by symptoms such as broken green, clear veins, and wrinkled leaves.

(4) The difference between the wilting of the phytotoxicity and the wilt of the infective disease

The wilting caused by phytotoxicity has no morbidity center, and most of them have a slow process, first yellowing, post-dead strain, no browning of roots and stems; the wilting caused by invasive diseases is mostly obstruction of tissue obstruction, in sunny, evaporation When it is big, it will first wilting, then it will lose green and die, and the root catheter often has browning.

(5) The difference between the slowness of phytotoxicity and the stiffness and deficiency of physiological diseases

The slowness caused by phytotoxicity is often accompanied by symptoms of plaques or other phytotoxicity, while the physiological poisoning is characterized by poor root growth, and the dysfunction of the deficiency is yellow or dark green.

Of course, no matter whether it is phytotoxicity or disease, in order to be more accurate in the self-diagnosis and identification, based on the above diagnosis, combined with professional identification, we can further obtain more accurate identification results.