There are many kinds of crop diseases, which can be divided into bacterial diseases, fungal diseases, viral diseases and physiological diseases, etc.
The main characteristics of various diseases
1. Fungal diseases
(1) Lesions of different shapes will be produced.
(2) Mildew or powder of different colors will be produced on the lesions, and there is no odor.
Fungal leaf mildew of tomato with visible mildew on the abaxial surface of the leaf
2. Bacterial diseases
(1) The lesions on the leaves are free of mildew or powder, and the lesions are thin and easy to break or string holes.
(2) The roots, stems and leaves are perishable and smelly.
(3) There are scabs on the fruit and small protrusions on the surface of the fruit.
(4) The vascular bundle at the tip of the root easily turns brown
(5) Bacterial pus often appeared in the diseased part.
Bacterial soft rot of cucumber
3. Viral diseases
The disease is mainly manifested in the young leaves, although the species is few, but the harm is big, easy to treat.
(1) Mosaic virus, withered leaves, yellow and green, gold yellow is easy to concave, dark green is easy to convex, disease-free leaves are flat, leaf eyebrow fan.
(2) The syncope leaf type, the leaf is slender, the vein is blunt, is linear.
(3) Rolling leaf type, the leaves are twisted and bent towards the water.
(4) Spotted type, on the ripe tomato fruit, it appears bluish-white, gradually rust-colored, not easy to color, and there are brown stripes on the inside and outside of the flesh. The capsicum fruit turns yellow at the tip, with short brown streaks at the yellowing area.
Cucumber virus disease
4. Physiological diseases
It is a non-biological disease and is not contagious. Generally below 20°C in the morning, the flowering and fruiting crops cannot bloom and pollinate normally, and are prone to hollow fruit, deformed fruit, and falling flowers and fruit. From 3:00 pm to midnight, the temperature is lower than 16°C, and nutrients are not easily transformed and accumulated on the leaves and flower buds, resulting in dark and thick leaves and small dark green, which facilitates melon and fruit drop, resulting in flower topping, melon topping, and self-topping. In the second half of the night, the temperature is lower than 10 ℃, which is easy to be hindered by low temperature, and the leaves are easy to age and dry.
Deficiency of Solanum Fruit and Vegetables: The crop faucet is bent, and the self-capping is easily boron deficiency. Insufficient flowering is also boron deficient. The stem tips of the new leaves that come out under the faucet are deficient in calcium. The new leaves under the faucet are yellow leaves that are deficient in sulfur. The new leaves under the dragon head are white leaves with iron deficiency.
All lower leaves turn yellow, which is magnesium deficiency. The lower leaf veins are green, the leaves are drooping, and the mesophyll has yellow spots, which is a manganese deficiency. The lower mesophyll turns yellow and the veins are green, which is zinc deficiency. The lower leaves are all green, and the yellow edge is potassium deficiency.
Magnesium deficiency in tomatoes
calcium deficiency in tomatoes
This fungicide is a life saver for plants! Fungus, bacteria, virus eradicate at one time!
Chlorobromoisocyanuric acid, also known as “Xiaobenling” and “Junduqing”, is widely used as an oxidizing disinfectant used in water companies, swimming pools, medical places, etc. It is said that it can also treat athlete’s foot.
50% chlorobromoisocyanuric acid is mostly used in agriculture. It is a broad-spectrum, high-efficiency, pollution-free and environmentally compatible pesticide. It has dual functions of systemic absorption and protection, and can quickly and effectively kill fungi that harm crops. , bacteria, viruses, and have special effects on difficult crop diseases.
Bactericidal mechanism of chlorobromoisocyanuric acid
Chlorobromoisocyanuric acid sprayed on the surface of crops can slowly release bromic acid. In water, hypobromous acid is 4 times more active than hypochlorous acid, and has a strong ability to kill bacteria and fungi. The parent after releasing hypobromous acid through systemic conduction forms triazine dione and s-triazine, which has a strong virucidal effect. It not only has a strong ability to prevent and kill bacteria, fungi and viruses, but also has the effect of promoting the vegetative growth of crops.
object of prevention
Rice: bacterial blight, bacterial leaf spot, sheath blight, rice blast, root rot, bakanae, stem rot, etc.
Leafy vegetables: cabbage soft rot, virus disease, bacterial wilt, anthracnose, downy mildew, fusarium wilt, blight, etc.
Melons: downy mildew, sclerotinia, powdery mildew, angular spot, virus disease, fusarium wilt, leaf spot, etc.
Citrus: scab, canker, rot, anthracnose, etc.
Solanaceae vegetables: late blight, bacterial wilt, rot, virus disease, etc.
Apple, pear, peach: scab, brown spot, rot, ring disease, perforation, gum flow, etc.
Grapes: Black pox, white rot, gray mold, brown spot.
Wheat, corn: sheath blight, scab, rust, rough shrinkage, leaf spot, and blight.
Ginger: ginger blast, bacterial wilt, etc.
Banana: leaf spot, etc.
Post time: Jun-20-2022