Tomato planting wants to be productive, and it is inseparable from the daily management of growers. Especially for the management and control of tomato pests and diseases, it has always been the knowledge that tomato growers always need to learn. The following series of Huinong.com introduces the common diseases of tomato to tomato growers. 1. Tomato fertilizer At the beginning of the fat damage, white to gray spots appeared on the surface of the leaves, and the lesions gradually expanded. The lesions were sometimes dark green in the middle of the lesions, and the lesions were perforated at the later stage. Because the amount of chemical fertilizer is too large, the roots are damaged and the absorption function is reduced. At this time, the leaves are mostly in a period of rapid growth, and the symptoms of the damage appear. 2, tomato boron deficiency The boron-deficient leaves are chlorotic or orange-red, the growth point is dark or black, the leaves are easy to fall, the roots are dysplastic and brown, prone to deformed fruit, and brown spots on the peel. Boron deficiency is caused by soil acidification, and boring of boron or excessive application of lime is likely to cause boron deficiency. 3, tomato magnesium deficiency Magnesium deficiency occurs in the lower part of the plant in the first flowering stage. The old leaves appear chlorotic, and the yellow veins appear in the veins. Later, the upper leaves expand to form the yellow-spotted leaves. The severe leaves are slightly stiff or the edges are rolled up, and the veins appear between the veins. Necrotic spots or brown band formation between the veins, causing the leaves to dry or whole leaves to the whole plant yellowing. 4, tomato 2,4-D phytotoxicity (flower) The leaves or growth points of the damaged tomato are bent downwards, the new leaves can not be unfolded normally, and the leaves become slender and the leaves are twisted and deformed; the flowers become brown and deformed, forming a deformed fruit. A 2,4-D excess was applied during the flowering time. 5, tomato nitrite gas hazard Physiological diseases. The nitrite damage is divided into acute and chronic, mainly affecting the leaves. Acute type: Many white necrotic spots are formed on the leaves, and severe spots are contiguous or dead. Chronic type: only the tip of the leaf or the leaf edge is yellowed first, then the middle is extended, and the diseased part is dry after whitish. 6, tomato salt disorders From the early stage of plant growth, the leaves are dark green, with a sense of hardening, and the plants are dwarfed; the heart leaves are curled; the shoulders are dark green, which is in sharp contrast with the fruit umbilical and fruit pedicles. The severe plants are wilting and the leaves are withered. . 7, tomato wood plug hard fruit On the surface of the diseased fruit, there are blocky cork-like brown spots. In severe cases, the plaques are connected to a large piece, which produces cracks of varying depths, and the skin of the diseased part becomes hard. 8, tomato top cracking fruit The tomato top cracking fruit is mainly caused by the cracking of the deformed flower style. The direct cause is the lack of nutrients supplied by the flower when the tomato is flowering. It is especially serious in the production season in the low temperature season or in the greenhouse. 9, tomato perforated fruit The stems and leaves grow normally, and there are holes in the fruit. The gelatinous substance in the flesh can be seen from the outside. 10, tomato brown fruit The brown fruit fruit turns red after ripening, but it shows brown or stained brown on the red fruit surface, causing the fruit to become dirty and the gloss is poor, which affects the appearance of the fruit. The brown fruit is mostly produced under the condition of partial application of nitrogen fertilizer and low temperature. Due to the reddish stage of tomato fruit coloring, the application of excessive nitrogen fertilizer, chlorophyll will increase, causing the chlorophyll decomposition to delay or slow down, affecting the formation of lycopene and carotene on the fruit, resulting in poor tomato coloration, easy to appear brown fruit. 11, tomato net weight The vascular under the pericarp is reticular, through the peel, the vascular bundle is clearly visible, and the symptoms are more obvious when the fruit matures. After the fruit is harvested, the fruit is soaked in water when it is rapidly softened. When the fruit is cut, some gelatinous material flows out. It is generally believed to be caused by high temperature, high fertilizer, and low soil moisture. 12, tomato malformed fruit The diseased fruit is characterized by ellipse, oblate, chrysanthemum, apex, transverse and top crack. The ventricle is more than normal, and it is also exposed as seeds. The diseased plants grow vigorously, the reproductive growth is degraded, the leaves are dark green, and the plants are tall. The above is a summary of the common disease knowledge about tomato in Xiaonong.com. The above-mentioned diseases are still relatively high in the process of tomato planting. Farmers should try their best to prevent it. Posture Corrector,Posture Support,Posture Corrector Device,Back Brace Posture Corrector Hebei Dingli Medical Equipment Co., Ltd. , https://www.dinglimed.com
