First, late blight
Late blight is a low-temperature, high-humidity disease that is prevalent in early spring and late fall. This disease is harmful during the entire growth period of tomato. The bacteria infested seedlings, leaves, stems and fruits. With leaves and fruits most affected. Infect the leaves and young fruit first, and gradually spread to stems and petioles to make it dark brown.
Control methods: Use 25% Amizyme suspension 1500 times to control the epidemic rate, or use 72% Kangling WP 600 times, or 69% Anke WP 600 times.
Second, early blight
Typical symptoms of early blight are infestation of 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.
Control methods; can be used 10% Amisida 1500 times, or levoptibe 1000 times spraying or spraying and smearing the diseased parts, especially the susceptible parts of infected organs to smear the disease better.
Third, powdery mildew
Powdery mildew usually occurs in the late and late stages of growth. It starts from the middle and lower leaves and begins to feel sick. There are white spots on the leaves at the beginning, and irregular white and mild layer lesions are formed on the leaves. In severe cases, the leaves are covered with white powder, until the leaves are dry.
Control methods: Use 25% Amisidae 1500 times, or 30% Teflon WP 2000 times.
Fourth, gray mold
Botrytis cinerea usually starts from the edge of the leaf margin and expands inwards with typical v-shaped lesions, and it also harms 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.
Control methods: Grasp the cucumber before transplanting, flowering period and fruit expansion period of 3 medication critical period. At the beginning of flowering period, female flowers were bred after adding 0.1% of 50% procymidone or 50% of iprodione in the dip solution.
V. 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.
Control methods: Because of its sudden and strong disease, it is recommended to use 25% Amizyme suspension agent 1500 times 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.
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