Common Diseases and Treatments of Tomatoes
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I. Late blight Late blight is a kind of sexual disease with low temperature and high temperatures. It is easy to prevail in the season when the temperature difference between early spring and late fall is large. This disease is harmful during the entire growth period of tomatoes. The bacteria infested seedlings, leaves, stems and fruits. With leaves and fruits most affected. Generally from the front of the shed to the onset of disease, first invade the leaves and young fruit, and gradually spread to the stems and petioles to make it dark brown. Remedy: Control the epidemic rate with 25% amidoxime suspension 1500 times, or use 72% Kangling WP 600 times, or 69% Anke WP 600 times.
Second, the early symptoms of early blight is mainly infected with leaves, stems and fruits. In general, the blade suffers serious damage. It appears as a small black spot like a needle tip, and it is constantly expanded into a rostral spot. There are more light green or yellow halos on the edges, and the surface of the circle is slightly hollowed to oval or shuttle lesions. There are thorn-like irregularities in the affected part and moldy parts in the lesion when wet. Treatment methods; can be used 10% Amisida 1500 times, or leveptin 1000 times spraying or spraying and smearing the disease, especially the infected parts of the infected parts of the shank parts to better apply the disease.
Third, powdery mildew Powdery mildew generally occurs in the late growth period, starting from the middle and lower leaves began to feel sick, early in the leaves with white spots, and then formed in the leaves of irregular sizes of white mold layer lesions. In severe cases, the leaves are covered with white powder, until the leaves are dry. Remedy: Use 25% Amistar 1500x, or 30% Teflon WP 2000x.
Fourth, gray mold Gray mold began from the edge of the tip of the leaf, the typical v-shaped lesions spread inward, while harming flowers and fruits. After the fruit is infected in the flowering period, the pathogen remains on the stigma, or on the petals and then spreads to the green fruit, fruit surface, and fruit stalk. The susceptible fruit is grayish white, soft rot, and grows a large number of gray green mold layers.
Fifth, gray leaf spot leaf spot disease is also called brown spot. It mainly damages the leaves, and it also harms the petiole when it is severe. At the beginning of the disease, the foliage was covered with light brown dots. The middle of the lesion was gray-brown to yellow-brown. The edges of the lesions were yellow-brown halo and the lesions were sunken. Later lesions were easily perforated. Treatment methods: Due to its sudden onset of disease, it is recommended that the use of 25% Amizyme suspension 1500 times liquid for prevention will have very good results. Can also be used 75% Dakkoning WP 600 times, or 25% Caesar Emulsion 1500 times, or 6% more than 1500 times the plough wettable powder spray.
In the process of planting, the above diseases often occur. It is hoped that the majority of vegetable farmers will actively seek early detection and early prevention so as to reduce unnecessary economic losses.