Core tips

The leaves of cucumber seedlings are delicate, weak in disease resistance, coupled with poor ventilation and seed bed ventilation, and high humidity, which can easily cause bacterial blight, anthrax, etc. Since anthracnose, blight, and bacterial diseases have similarities, downy mildew and bacteriological angular spot disease are not easily distinguished. Bacterial damping-off and damping-off disease are also easily confused. Therefore, the authors present the symptoms of major diseases of these seedlings. Describe it to help farmers identify and take appropriate countermeasures.

Anthracnose in cucumber

The occurrence of cucumber anthracnose is closely related to the improper cultivation and management of double cropping. The lesions mainly occur on the leaf surface and petioles, and the infected stem vines cause severe rot. At the early stage of disease, the lesions were oval, nearly round, brown, and pitted. In severe cases, the lesions are contiguous and cause the leaves to die.

For the prevention and treatment of the disease, 40% Dufu Bromo WP 500 times, 25% Bromozoon Emulsion 700x, or anthrax 800x can be used, and sprayed once every 7-10 days. It is worth noting that the disease should be treated early in the initial stage of the disease and prevented in advance.

Cucumber sp

Cucumber bacterial blight usually begins with a "V" shape inwardly from the margin of the leaf margin. The lesions are nearly round or irregular in shape, with water-stained, no obvious ring veins, and many small black spots on the surface. There is no regularity. It also does not secrete pink mucus under wet conditions.

Anthracnose and blight are caused by fungi, so there are many common points in the prevention and control, the use of pesticides is similar, in the strengthening of the greenhouse temperature and humidity management, timely ventilation and humidity, reducing leaf condensation and spit water at the same time, In the seedling stage, potassium dihydrogen phosphate 750 times or alginic acid 1000 times can be sprayed to increase the plant resistance to disease.

The agent for preventing and treating the disease is 70% thiophanate-methyl wettable powder or 80% mancozeb WP wettable powder 600-800 times, 38% copper fluocin, 800-1200 times liquid, 20% fluorosiliconazole Prochloraz 800 times, 56% azoxystrobin 600 times, 58% metalaxyl MnZn WP 500-600 times, 50% thiram WP and 50% carbendazim wettability Powder 1:1 mixed 300 times.

Cucumber damping-off

The cucumber seedlings that had just been excavated had no obvious disease on the ground, and the seedlings suddenly fell to the ground and died. The onset often starts with the dripping of sheds and quickly expands as if they are “shaved”. The seedlings near the surface of the excavated seedlings showed water-like yellowing, softening, contraction and linear appearance. When the humidity was high, white floc was observed in the diseased part.

To control the disease, we must first disinfect the seed and bed soil. Seeds were primed after soaking in warm water at 55°C for 15 minutes. The bed soil was selected from disease-free new soil, and the seedbed soil was disinfected. The seedbed per square meter was filled with 50% seed dressing double powder 7 grams, or 40% pentachloronitrobenzene powder 9 grams. 1/3 drug soil pad seed, 2/3 drug soil cover seed, cover seed soil should be 1-2 cm thick. Followed by biological control. When planting seedlings, 250 grams of “5406” bacteria are applied to the seedbed per square meter, which can prevent the occurrence of damping off, or can be sowed after every 250-300 grams of seeds are grown with 5 grams of the production-promoting bacteria. When the disease occurs individually or just after it, it can spray 5-10 Jinggangmycin agent 800-1000 times, combined with the release of dampness. The last is the use of chemical control. At the beginning of the disease, spray 72.2% Preclosure 600 times, or 15% Hymex Aqueous Solution 450 times, or 25% Methofenol 1000-1500 times. Can also be used carbendazim 500 times, 75% chlorothalonil wettable powder 600 times, 64% antitoxic WP 500 times, 70% mancozeb wettable powder 500 times, spraying, seedbed humidity When large, the above reagents can be used to dilute the water 50-60 times, mix the appropriate amount of fine soil or fine sand in the seedbed evenly, 7-10 days to prevent and control once, and even prevent 2-3 times.

Cucumber Blight

The disease mostly occurs in the middle and late stages of nursery. At the time of onset, oval-shaped brown lesions appeared at the base of the stem, the lesions gradually sag, and the diseased part curled around the circumference of the stem. At the early stage of disease, the seedlings are wilted during the day and can be recovered at night. In severe cases, the plants wither and die.

Prevention and treatment of the disease, good seed disinfection, bed soil disinfection, killing the bacteria; after spraying, spraying 10% azoxystrobin to prevent 1500 times. 50% carbendazim WP plus 80% mancozeb 600 times after spraying, or 5% Jinggangmycin 1000 times plus 70% Thiophanate 1000 times Shi.

Cucumber roots

No new roots or adventitious roots are found in the seedlings or adult plants. The root rind is rotted and rots easily. It is easy to pull up, and the cortex sheds, resulting in wilting in the aboveground parts. The shoots of the aboveground leaves are wilted and dry. In severe cases, they become dry; the soil temperature is low for a long time. At 12°C, coupled with excessive watering or occasional rainy weather, lack of light, the roots of melon seedlings are hindered to breathe at low temperature, over humid and anoxic conditions, water absorption capacity is reduced, vitality is destroyed, wilting occurs, and wilting lasts for a long time. Roots will occur.

To control the roots of cucumber roots, the seedbed should be kept from getting too wet or the ground temperature is too low. The temperature of the seedbed should be controlled at about 16°C. Generally it should not be lower than 12°C. The bed soil should be loose and smooth, and the bottom water should be poured once at the time of sowing, and the water should be properly controlled afterwards to prevent the seedbed from getting too wet. To increase the amount of ventilation. After the occurrence of a slight rooting, it is necessary to loosen the soil immediately and increase the temperature of the ground. After the new root grows, it will be transferred to normal management.

Cucumber downy mildew

There is no light perception on the leaves of downy mildew, which mainly damages the leaves. The lesions are dark in color and are yellow-brown. They do not have cracks or perforations. The back of the diseased leaves has black or purple gray mildew layer. The lesions are large and the infection rate is fast. The lesions are connected to one another and the back of the diseased leaf is irregularly immersed in water.

For the prevention of downy mildew, 69% of dimethomorph may be used as a 1000-fold solution, or 72% of propamocarb may be used as a 1000-fold solution, or 70% of fenazole-zinc propionate as a 1000-fold solution, or 68.75% of fluoxysporoxime hydrochloride may be used. 1400 times, or 70% thiophanate-methyl wettable powder 1000 times, or 64% naphtha Mn-Zn wettable powder 400 times.

Cucumber angular spot

Keloid disease leaves have a light perception, mainly impregnated leaves and melon strips, sometimes pests melon vines; lesions lighter, grayish, easy to crack early, the formation of perforation; leaves on the back of the disease Department milky white liquid, dry after White film or white powder; lesions are small and the rate of dyeing is slow;

In the early stage of disease, 86.2% cuprous oxide 1000 times, 25% WP, 800% solution, 47% spring copper oxide wettable powder 800-1000 times, 14% ammonia solution 300 times, 30 %DT fungicide 500 times, spray every 5-7 days, even spray 3-4 times.

The following points should be noted when spraying and preventing diseases during seedling spraying: First, pesticides that do not produce phytotoxicity should be sprayed; Second, pesticides that can treat two or more diseases should be used as far as possible; Third, sprays should be strictly formulated And dosage to prevent phytotoxicity.

Complete Greenhouse

A greenhouse(also called hothouse)is a building or complex in which allow for greater control over the growing environment of plants. Depending upon the technical specification of a greenhouse, key factors which may be controlled include temperature, levels of light and shade, irrigation, fertilizer application, and atmospheric humidity. Greenhouse may be used to overcome shortcomings in the growing qualities of a piece of land, such as a short growing season or poor light levels, greenhouses are often used for growing flowers, vegetables, fruits, transplants and seedlings. Greenhouses can be divided into glass greenhouses and plastic greenhouses. Plastics mostly used are polyethylene film and multiwall sheets of polycarbonate material, or PMMA acrylic glass. Commercial glass greenhouse are often high-tech production facilities for vegetables or flowers. The glass greenhouse are filled with equipment such as screening installations, heating, cooling and lighting, and may be automatically controlled by a computer.

Agriculture Greenhouse,Plastic Film Greenhouse,Glass Greenhouse,Pc Board Greenhouse

JIANGSU SKYPLAN GREENHOUSE TECHNOLOGY CO.,LTD , https://www.thgreenhouse.com