What medicine is the best for the occurrence of leaf blight in the plant?

Leaf blight is a kind of disease, which mainly harms the leaves of the plant. if not controlled, the disease will spread from one leaf to the leaves of the whole plant, causing the leaves of the whole plant to dry up and fall off. So, which medicine is the best for the occurrence of leaf blight in the plant?

First, brief introduction of leaf blight!

1. When will leaf blight occur?

Leaf blight can occur from July to October, mostly from leaf edge and leaf tip infection, high temperature and humidity, poor ventilation are conducive to the occurrence of the disease, plant growth potential is more serious, the lower leaves of the plant is serious.

2. What are the symptoms of leaf blight?

Leaf blight mostly occurs from leaf edge and leaf tip infection, and the disease spot is irregular from small to large. At first, the diseased leaf turns yellow, then brown, and gradually extends from local to whole leaf vein, showing brown to reddish brown leaf edge disease spot, and then black fluffy or black dots appear on both sides of the diseased leaf.

Which plants will suffer from leaf blight?

Generally speaking, leaf blight occurs in almost all leafy plants, such as cucumber, garlic, watermelon, strawberry, rose, sweet-scented osmanthus, camellia, orchid, rice, wheat, etc., as well as on some shoots, branches and fruits.

1. Cucumber leaf blight usually occurs during the period of low temperature in early spring, the suitable temperature range is 3-30 ℃, the optimum environmental temperature is 8: 20 ℃, the relative humidity is more than 95%, and the incubation period is 7-15 days; the main harmful leaves are round or irregular, 1-2 mm in diameter, brown, with or without yellow halo on the periphery, gray-brown or dark-brown mildew on the spot, and die in severe cases.

2. Strawberry leaf blight: it mostly occurs in the weather with more rain and dew in autumn and early spring, mainly harming leaves, petioles, calyx and fruit stalks. At the beginning of the disease, purple-brown matte spots are produced on the leaf surface, and the spots will gradually expand. When the disease is serious, the whole leaf surface is covered with disease spots, and the whole leaf is yellow-brown to dark brown in the later stage; after the petiole or fruit stalk occurs, the disease spot is dark brown, slightly sunken, crisp and easy to break.

3. Sweet-scented osmanthus leaf blight: it mostly occurs from July to November, and the optimum temperature for development is about 27 ℃. It will be seriously ill when it is humid and stuffy, poor ventilation or weak plant growth. It generally occurs at the leaf edge and tip of sweet-scented osmanthus leaves, beginning with light brown dots, and then gradually expanding into irregular large patches. If several disease spots are connected, the whole leaf will dry up and reach 3-1 gray brown to reddish brown. In the later stage, there are many small black spots scattered in the disease part.

4. Wheat leaf blight: mostly occurs at the heading stage of wheat, and the condition of low temperature and humidity is conducive to the occurrence and expansion of the disease; it mainly harms leaves and leaf sheaths, and small oval yellowish yellow to light green spots grow on the newly diseased leaves, and then expand rapidly, forming irregular yellow-white to yellowish brown patches, generally starting from the lower leaves to die and gradually develop upward, resulting in plant weakness and even death.

Third, which medicine is the best for leaf blight?

1. If the plant has leaf blight, you can use 100 times Bordeaux solution, 50% topiramine 500800 times, 50% carbendazim wettable powder 1000 times (or 40% gel suspension 1000 times), 50% benzoate 1000-1500 times, 65% Dysen zinc 500 times and other agents, which can be selected or used alternately, spraying medicine every 10 days or so, several times can be effectively controlled.

2. in addition to the use of chemical control, it is necessary to apply sufficient base fertilizer to improve disease resistance; to clean up the ditch system in time to prevent stagnant water after rain, so as not to provide good conditions for diseases; to be ventilated regularly, to reduce leaf humidity, and to reduce the chance of infection; to remove diseased leaves in time and remove diseased leaves to reduce the source of infection; to select disease-free seeds and promote crop rotation to prevent diseases from continuing to infect.

The above is the introduction and control methods of leaf blight, if the occurrence of leaf blight, you can use chemicals to control, and usually should pay attention to do not create conditions for the production of leaf blight, in order to reduce the spread of bacteria.