After a winter season, the stems and leaves of the vegetables are weak, and the resistance is reduced. Diseases occur frequently. Many vegetable farmers increased their spraying efforts before the Spring Festival in order to prevent diseases; some greenhouse diseases have already occurred, and vegetable farmers are eager to treat diseases and increase medication. The problem of concentration and increase in the number of medications is even more prominent, resulting in frequent occurrence of phytotoxicity in the shed after the Spring Festival.
Judgment of phytotoxicity needs attention
In the actual production process, vegetable farmers often encounter some similar conditions with the symptoms of drug injury, need to distinguish clearly, to prevent the use of improper measures, increase the symptoms, or delay the appropriate control.
One is insect pests. When plants are affected by aphids, aphids, and thrips, they may also cause leaf shrinkage, slow growth, and even symptoms such as flowering and defoliation. Among them, the symptoms most likely to be confused with phytotoxicity after locust infestation, the main difference is that after the locust infestation, the back of the leaf turns brown with oily, distorted deformity, downward curling, and the leaves will have a special odor after being damaged by the locust.
The second is the lack of nutrients or excessive fertilization. The imbalance of nutrients in the greenhouse soil can also lead to abnormal plant growth and symptoms similar to phytotoxicity. For example, the lack of nitrogen fertilizer will cause yellowing of the leaves and even the appearance of dead spots; when the fertilizer damage occurs, it will easily cause symptoms such as tip burns and dryness.
The third is environmental factors. When plants are subjected to stress, they will affect the growth of the plants. For example, frost damage and high temperature may cause damage to shoots, leaves and flowers of plants; long-term drought can cause poor growth of vegetables, plants become shorter and shorter, wilting, leaf edge necrosis; harmful gases can make the leaves of plants yellow, plant wilting Even the entire plant dies; poor soil permeability can also affect the normal growth of the crop.
Remedy after phytotoxicity
After the occurrence of phytotoxicity, how to relieve the phytotoxicity to allow vegetables to resume growth as soon as possible and avoid serious reduction in yield is the most concerned issue for vegetable farmers.
Relieving the damage caused by phytotoxicity in vegetables caused by the death of cells or tissues, dry growth, weakened growth, etc. Different remedies should be taken according to different manifestations.
For overdose or repeated drug use, once found, immediately rinse with plenty of clean water, spray repeatedly 2-3 times, try to wash out the pesticide on the surface of the vegetables, which is the medicine for pesticides with poor systemic absorption The harm effect is better. However, if the effect of a drug with a strong systemic absorption is not good, if the leaves or tissues of the leaves are dead and dry, the site where the injury is serious or the middle and lower old leaves should be removed. On the one hand, the absorption of systemically absorbed drugs can be alleviated, and on the other hand, infection by pathogens can be avoided. Finally, the drug can be sprayed and used to reduce the transpiration of vegetables by every 15 kilograms of water against 2-3 aspirin to ease the harm of the drug. At the same time, Yunda 120, nucleotides, love overdose and other drugs are sprayed to promote the rapid recovery of vegetable growth. .
For the phytotoxicity caused by the use of azole pesticides, the temperature of the greenhouse can be appropriately increased and the amount of water and fertilizer can be increased to promote absorption. At the same time, the growth promoters such as 6,000 fold, 2000 times 4% gibberellin, and 1500 times brassin lactone can be used. Promote vegetative growth. For the hormone poisoning caused by the excessive amount of Chinese herbal medicine, sprayed flowers or small flowers, it can be sprayed with 2000 times 4% gibberellin; the problem of excessive use of gibberellin can be sprayed 1500 times 15% paclobutrazol to inhibit the plant itself The formation of gibberellin, and sprayed with anti-dropping hormones to relieve symptoms of hormone poisoning.
For herbicide-induced phytotoxicity, such as contact-killing herbicides, such as propanil, herbicide ether, etc., it only harms the vegetable organs that are in contact with it, and it is only necessary to remove the site where the phytotoxicity occurred.
After the rejuvenation of plants, the vegetative and reproductive growth of vegetables will have a great impact. At this time, we should first pay attention to establish the advantage of vegetative growth and cultivate strong plants.
First, remove the flowers and fruits from the plants in time to reduce nutrient consumption. The photosynthetic efficiency of the injured leaves is reduced, nutrition is insufficient, young fruit is difficult to sit on, and there are many malformed fruits. It is recommended that they be removed in time. After harvesting cucumbers, the flowers and melons in the internodes should be removed in time, especially near the growing point. For the particularly delicate plants, the large melons must be removed.
Second, the greenhouse must ensure sufficient light and temperature and humidity, promote the formation of photosynthetic products, and ensure the growth point and the rapid growth of the root system. After the victimization, the temperature can be gradually increased, and the temperature can be increased by 2-3°C based on the suitable temperature. The ventilation can ensure the adequate supply of carbon dioxide in the shed and promote the vegetative growth of the plant to recover as soon as possible.
Again, timely replenish fertilizer. It is suggested that a large number of element fertilizers and rooted roots should be used for the rotation of fertilizers, supplementing nutrients and promoting root growth. At this time, watering should pay attention to avoid flooding and lead to roots "slow."
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