The tomato leaves are the important organs for photosynthesis and are tomato processing plants. The size, color, and softness of the leaves are all important physiological indicators of tomato. However, due to some unfavorable factors, tomato leaves appear abnormal. In addition to the diagnosis, there is an important basis for the judgment that the abnormal parts of the tomato leaf are in the parts of the plant, that is, the lower leaf, the middle leaf, the upper leaf, or the top, or the whole plant. Half Cut Crab,Frozen Cut Crab Seafood,Half Cut Blue Swimming Crab,Frozen Portunus Trituberculatus Zhoushan Haiwang Seafood Co., Ltd. , https://www.haiwangseafoods.com
I. Abnormal leaves in the middle leaves, mainly ammonia harm
On February 1st, the sudden emergence of the leaves of the tomatoes in the sheds of Xidanjia Village in Weicheng District of Shijiazhuang City was abnormal. The middle leaves of the plants had plaques and the leaves were hot. Look carefully, the symptoms of the leaves appear in the leaf margins, water stains cyanosis. It is understood that the sheds where this disease has occurred have not been opened for several consecutive days in recent days. When asked about fertilization, chicken manure was applied to these households. Analyze the above conditions and diagnose that the leaves are smoked by ammonia.
Prevention and control suggestions: ammonia harm using acid-base neutralization method. The use of edible vinegar spray, formula: 1% vinegar + love more than 6000 times the liquid, sprayed 5 days, even spray 2 times, sunny pouring a small water.
Second, the abnormal upper leaves, mainly smoke damage
In a tomato shed in Xixinzhuang Village, Xiangcheng District, Shijiazhuang City, the middle leaves of the tomato plant were smashed, and the leaves were water-stained from the edge. Most of the upper leaves are tall and straight, and there is no discoloration. A few of the top leaves of the plants are a little scared. At that time, the farmers thought that there was a problem with the smoke agent and caused smoke after use. According to the condition of the median leaf, we think it is ammonia harm. Analysis, a few plants on the top leaves a little cry, should be caused by smoke, but the problem is the snowfall after the use of smoke agents, farmers in order to maintain a certain temperature within the shed, to avoid plant damage, no ventilation for several days. In particular, on the morning of the second day after the smoldering, the smoke should be ventilated as required, but the farmers did not do so, and the smoke in the shed also caused minor smoke. The reason for the diagnosis of ammonia damage is based on the presence of leaf abnormalities in the median lobe. To further understand the fertilization situation of farmers, the farmer did implement raw chicken manure.
Prevention Suggestions: Ventilation and smoke should be taken immediately after the occurrence of tobacco damage, and spray more than 6000 times liquid plus foliar fertilizer (including zinc), spray once every 5 days, spray twice or use 500 times liquid spray. Shi, sprayed once a day for 7 days, 2 times in a row.
Third, the abnormal position of the lower lobe, mostly physiological leaf and yellow leaf
Raoyangyi tomato growers reported that the tomatoes had already had three panicles and found that the top stems were reddened, and the lower 5-6 leaves were rolled up and yellowed. Diagnosis is a physiological leaf roll.
Physiological leaf is a common disease in tomato, and a few varieties are affected by genetic factors. Leaf rolling is normal. Most varieties of leaves should be flat, soft and tender green. In the event of illness, the blades were rolled up into a boat, and the severe rolls were barrel-shaped. The leaves are thick, stiff and brittle. Due to the deterioration of the leaves, the photosynthetic capacity decreased, resulting in insufficient supply of nutrients to the fruits, making the fruit smaller, and in severe cases the fruit setting rate decreased and the quality also declined. Therefore, although the physiological leaf seems to be only a leaf blade, the impact is very large.
There are several reasons for the physiological rolling of tomatoes, one of which is improper pruning. Premature pruning or over-picking, plant leaf area is too small, affecting the photosynthesis, the supply of products is insufficient, resulting directly in poor growth above the ground. At the same time, it also affects the growth of the root system with a small number of roots, which restricts the absorption and supply of moisture and nutrients and induces leaf curling. The lower leaf is affected first. The second is high temperature, strong light and drought. The main reason is that the water supply of the leaves cannot keep up with the transpiration of the leaves, causing the leaves to roll up. Sometimes high water suddenly watered at noon, and the plants could not adapt to sudden changes in conditions, causing physiological leaf curls. These are the most common reasons for production. The third is that the soil salinization sheds often have rolling leaves. More nitrogen, iron and manganese deficiency. The fourth is that after the low temperature has been turned on, the sun suddenly turns fine, and the transpiration suddenly accelerates, the water supply is not as good, and the leaves will roll up.
Prevention Suggestions: After the appearance of physiological leaf curls, the problem of soil water shortage and excessive fertilizer should be promptly corrected. The pruning time can be destroyed only after the length of the lateral shoots is 5 centimeters. When picking the heart, it must not be “scratched†and the last layer of fruit should remain. Two leaves. The emergency control formula is taken in a coordinated manner. The foliar spray foliar fertilizer + love more, the root flush organic fertilizer + chitin, or the microbial water-soluble fertilizer in the Moshi soil, with the chemical fertilizer interval flushing, a growth season 2-3 times Promote root development, improve soil environment, and make plants healthy.
The yellow leaves also occur first in the lower leaves, showing green veins, yellow leaves, and irregular brown patches in the mesophyll. This symptom is often confused with leaf mold in production. One method of differentiation is that both diseases develop from the lower leaf to the upper part, but the yellowing leaf has no effect with symptomatic fungicides. The second is that the leaf chlorosis is yellow on the front of the leaf mold, but there is a thick layer of black gray or purplish black mold on the opposite side of the leaf blade; the yellow layer does not give off the mold layer but only the dry spots on the back of the brown spots.
Yellow leaf is a magnesium deficiency disorder. Soil salinization is usually produced in production, and acidic soils affect magnesium absorption. Therefore, if the soil surface is green, the lower leaves of the tomato are generally yellow leaves.
Prevention advice: also need to adjust the way up and down coordination, foliar spray 500 times liquid green wind 95 + love more than 6000 times liquid, 7 days spray 1, even spray 2 times; root flush biological agent, such as wood woodland Reagan Baby, 4 liters per mu, 15 times a day for 15-20 days, and 2 consecutive flushes to restore the natural metabolic function of the soil.
Fourth, the whole blade abnormalities, common wilting disease
In recent days, Raoyang farmers consulted and the tomato plants began to wilt from the top, the leaves did not have lesions, and the normal roots were checked, and the number of white roots was also large. Check the tomato stems, there is no browning inside, you can rule out root diseases, such as root rot, root damage, but also can rule out stem diseases, such as stem rot, blight and Verticillium wilt.
Inquired about the pathogenesis, and the rest of the management was normal. It was a few days after a 25-kilogram compound fertilizer was rushed in an acre. The analysis is that the fertilization causes high concentration of salt ions in the soil, the root system of plants is affected by the reverse osmotic pressure, and the absorption of water is not possible, resulting in wilting. At present, the amount of fertilizer used in vegetable growing is generally high, coupled with high amount of fertilizer, and the concentration of soil solution is too high, so wilting often occurs.
Prevention and control suggestions: pouring water, leaf spray love more or clear water. Love more can be used to accelerate the circulation of the plant, used to ease wilting. Clear water is a replenishment of foliage and can also alleviate wilting.