Tomato is one of the common vegetables in our life. It can be eaten raw, cooked, and processed with tomato sauce. The economic benefits of planting are not bad. However, in recent years, the occurrence of tomato physiological diseases has been increasing year by year. Therefore, today Xiaobian talks about the common diseases in the process of tomato planting, and hopes to help everyone.
(1) Growth point stops growing
Stopping growth at the growth point can also be called "no seedlings", which can occur in both the seedling stage and the adult stage. In the adult stage, the growth point of the first or second spikes stops growing, which is similar to “self-sealingâ€. The main reason for this is the physiological boron deficiency caused by low temperature and high temperature in the seedling stage, especially the weak growth. Variety, the probability of occurrence is slightly higher.
(2) The number of tomato flowers is small, weak flowers, small flowers or a whole flower does not appear, it is not easy to sit fruit
Tomato flower bud differentiation is greatly affected by environmental conditions. If severe hypothermia or high temperature of 35-40 degrees occurs during flower bud differentiation, flower bud differentiation will stop. If the first ear differentiation stops, then the main stem tenth section will appear. The phenomenon of the first spike flower appears; if only the second spike flower is terminated, there will be a special phenomenon in which the first spike flower and the second spike flower are separated by more than five leaves. In severe cases, the flower with weak birth vigor will be differentiated, and the flower is weak, The flower is small, does not take fruit, and forms a bean fruit or a stiff fruit.
(3) deformed fruit, flat fruit, young fruit cracked and leaked seeds
During the flower bud differentiation period of tomato two to six leaves, if the night temperature is lower than 12, especially in the case of long-term 5-8 degrees, the deformed fruit is prone to occur. At the same time, the tomato seedling stage has excessive nitrogen fertilizer, calcium deficiency, boron deficiency, length, and flower. This situation can also occur under heavy conditions. Calcium deficiency and boron deficiency are also important reasons for the formation of young fruit cracking. Therefore, it is best to spray or water every 10-15 days from the beginning of seedling to the fruit picking period. 300 times milk, soy milk, reduce the cracking of young fruit.
(4) Tomato fruit is small, stiff, fruit
The main reasons for tomato fruit small, stiff fruit and bean fruit are as follows: tomato planting slow seedling first water, fertilizer pouring too early or too late, nutrient growth is too weak, plant nutrition is insufficient to form small fruit or beans, Stiffness; excessive planting density, insufficient fertility, less photosynthetic accumulation, easy to form small fruit; no change of head pruning, resulting in the formation of 4-5 layers of fruit undernutrition; when the flower is abnormal, the flower concentration is too low Or too late, causing hormone deficiency to form a fruit or small fruit; the light is weak during the fruit development period, and the temperature is low.
(5) Empty fruit
The fruit formation of tomato fruit has the following reasons: the hormones that promote fruit setting are used too early and the concentration is too heavy; the nutrients produced by photosynthesis cannot satisfy the growth and development of the third and fourth layers of fruit, it is recommended to change the head and pruning, strengthen the management of fertilizer and water; The light should be improved and the management of water, fertilizer and temperature should be strengthened; the nutritional status of tomato plants can not meet the needs of fruit enlargement; the night temperature is too high, the plants are long, and the photosynthetic products cannot be transported smoothly into the fruit.
(6) Display net fruit (netted fruit, net weight fruit)
The seedlings are thin and aging, the seedlings are long, the scorpions are weak, and the fruit is severely dehydrated during the expansion period. Especially the tomato varieties with weak growth tend to have a high probability of showing fruit, and it is difficult to recover.
(7) Yellow leaves of tomato leaves
The yellowness of tomato leaf flesh is mainly caused by physiological magnesium deficiency. It is known that the low temperature stage is in October-March. Due to the low ground temperature, the tomato root absorption capacity is affected, so that magnesium can not be absorbed and the leaves become yellow. The specific solutions are: spraying magnesium sulfate on the leaf surface; increasing the leaf area before fruit setting increases root growth; increasing soil temperature and promoting root absorption.
(8) Tomato leaves are twisted and fern leaves.
The leaf distortion of the plant is caused by the high level of endogenous hormones that promote fruit setting when the tomato transitions from vegetative growth to growth. In the other period, most of the time occurred after the flowering of the ear of the third ear, and the upper leaf was fern-like. The solution is to strengthen the nutrition of the plant, increase the light, spray the foliar fertilizer, apply the potassium fertilizer, and reduce the concentration of the flower hormone.
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