In recent years, with the expansion of the planting area of seed-used zucchini, the occurrence of diseases and insect pests of zucchini has also increased. What are the common diseases and insect pests in the planting process? How to prevent it? This article will lead you to understand the common diseases and pests of seed squash and control measures.

Seed zucchini is an annual vine herb of Cucurbitaceae and Cucurbita. The vine is strong, the leaves are shaped like heart, grow fast, the colony structure is good, the whole growth period is 98d, the melon is round or oval, it is dark green when immature and golden when fully ripe. The weight of single melon is 2.0-3.5 kg, the number of single melon seeds is 320-680, the weight of 1000 seeds is 162 g, and the seeds are dark green.

The seeds of seed-used zucchini seeds have high nutritional value and unique health care efficacy, especially with a unique, very stimulating nut flavor and aroma, it makes the bread, milk salad and nuts with food, have attractive taste and taste. In Europe and the United States, but also pressed into edible oil, not only can play a good health effect. It also contains essential micronutrient such as amino acids, vitamins B, C and E, as well as calcium, magnesium, iron and zinc, which are widely used in the food, pharmaceutical and cosmetic industries.

Powdery mildew

It is a disease with wide distribution, wide spread and high speed. The control of powdery mildew of seeded zucchini should be done

Early prevention, early detection, early control.

Symptoms:

It can occur from seedling stage to harvest stage, the leaf is more seriously infected, the petiole and stem are second, and the fruit is seldom damaged. At the early stage of the disease, the leaves or the back of the leaves and young stems were covered with small round white spots, many of which were on the front of the leaves, and then spread into a series of pieces of white powder with unclear edges. The serious leaves were covered with white powder and gradually withered. After the occurrence of powdery mildew, the photosynthetic efficiency of the leaves of the plants decreased, and the nutrients needed for the development of the fruits and seeds could not be effectively supplied.

Routes of transmission and conditions of onset:

Powdery mildew can overwinter on the diseased remains of cucurbit crops and become the source of infection at the beginning of next year. Reinfection in the field is mainly caused by the conidia produced after the outbreak of the disease spread by airflow and rain. The pathogen reproduces rapidly, especially when the high temperature, drought and high humidity conditions occur alternately. Excessive cultivation, insufficient illumination, extensive management, excessive plant growth and premature senescence all contributed to the serious occurrence of powdery mildew.

How:

1. Rotate with cucurbit crops for more than 3 years

2. Select the varieties resistant to powdery mildew

3. Using medicine to prevent the early stage of the expansion of melon strips, 20% Triadimefon 2000 times liquid, spraying once every 7-10 days, spraying 2-3 times in total, or foliar application of 30% hexazol · Kresoxim Ester 8-12 g/mu, sulphur suspension, or 30% difenoconazole 7.5 g/mu, or 30% hexazol 5 g/mu, farmers are advised to spray 2-3 times. Above medicaments had better use alternately.

Second, limp disease

Symptoms:

The disease could occur in seedling stage and adult stage. Seedlings infected, cotyledons dull, dark green, cotyledons turn yellow, slow growth or stagnation of growth to death. The leaves on one side of the plant or at the base of the plant became yellow and increased with the growth of the plant. When the disease was serious, the leaves became all over the plant and the whole plant died, a few cm to 30 cm long, longitudinal planing disease stem vascular bundles become yellow-brown. When the humidity is high, the disease surface white to pink mold, sometimes the disease overflow a small amount of red-brown colloid.

Routes of transmission and conditions of onset:

Hyphae or conidia overwintered in soil with the remains of the disease and became the primary source of infection. Invasion from root wound or root cap cell space, the underground rarely repeated infection. Seedling aging, continuous cropping, organic fertilizer is not ripe, partial application of nitrogen fertilizer, low soil pH or low-lying water prone to disease.

How:

1. Select resistant varieties.

2. Avoid continuous cropping with cucurbit crops, rotation more than 3 years.

3. Irrigate the root with medicament. Before or at the beginning of the disease, 100 ml of 10% cupric aqueous solution of mixed amino acid, 1000 times of 20% risperidone methyl EC and 200-300 times of Carbendazim solution were used, after 10 days, once again, continuous control 2-3 times.

Seed gourd pests

1. Aphids: in the initial stage, 10% imidacloprid wettable powder 1500 times liquid, spray control once.

2. Red Spider: in the early stage, 73% kmite 1000 times solution, or 25% manganite 1200 times solution spray control, agent alternate use.