When is the best time to plant zucchini?

Zucchini has a certain degree of cold resistance, but is not resistant to high temperatures. The suitable temperature for its growth is between 20-25°C. As a vegetable with good taste, more and more farmers have been planting it in recent years. Let’s learn below: When is the best time to plant zucchini?

When is the best time to plant zucchini?

Zucchini is suitable for planting in spring and autumn. The spring sowing time is generally in early May. The temperature during this period is suitable, which is conducive to seed germination and plant growth. The autumn sowing time is in early September. It is also necessary to ensure that the temperature is within the appropriate growth range to avoid high or low temperatures that affect the growth of zucchini.

What are the diseases and pests of zucchini?

1. Leaf blight

Symptoms: Usually appear in the middle and late stages of growth, and old leaves are more susceptible to the disease. The lesions start as small yellow-brown spots, gradually expanding into large round or irregular necrotic spots, eventually leading to leaf death.

Prevention and control: Physical methods include crop rotation, deep plowing of the soil, and mulching of high ridges with mulch film; chemical methods include spraying 77% Tonin wettable powder or 77% Kesacid wettable powder at the early stage of the disease.

2. Powdery mildew

Symptoms: White circular spots appear on the leaves or stems, which then spread into patches. Small yellow-brown dots may appear on the spots.

Prevention and control: Reduce the humidity in the greenhouse and spray 20% oxycarboxin in the early stage of the disease.

3. Viral diseases

Symptoms: Yellow-green spots appear on the leaves, which become wrinkled and curled. In severe cases, this may affect fruit setting and cause the leaves to become deformed and yellow.

Prevention and control: Choose disease-resistant varieties and spray 20% virus A at the early stage of the disease.

4. Botrytis cinerea

Symptoms: Mainly harms flowers and young melons, causing the fruits to shrink and rot and grow black sclerotia.

Prevention and control: Control humidity and spray 20% oxycarboxin or 70% thiophanate-methyl in the early stage of the disease.

5. Cotton rot

Symptoms: Dark green water-soaked spots appear on the fruit, the flesh rots, and white mold grows on the surface.

Prevention and control: Cultivate on high ridges, water under the film, and spray 14% copper chlorothalonil in the early stage of the disease.

6. Downy Mildew

Symptoms: Mainly harms the leaves. In the early stage of the disease, water-soaked spots appear on the back of the leaves. In severe cases, the leaves turn yellow and die.

Prevention and control: Reasonable density of planting, increase the application of phosphorus and potassium fertilizers, and spray 58% metalaxyl mancozeb or 75% chlorpyrifos at the early stage of the disease.

7. Anthrax

Symptoms: May occur throughout the growing season, with lesions appearing on stems and petioles, and reddish-brown lesions on leaves, which eventually dry up and die.

Prevention and control: Soak seeds with drugs, strengthen field management, and spray 70% thiophanate-methyl or 70% mancozeb in the early stage of the disease.

8. Pest control

Whitefly: Fumigate the insect mouths thoroughly, kill with yellow boards, and spray pesticides at an early stage for prevention and control.

Leaf miner: Keep the field clean, apply well-rotted soil and fertilizer, and spray trichlorfon in time.

To sum up, the planting time of zucchini should be chosen during the suitable temperature period in spring and autumn, while ensuring sufficient light, appropriate water and suitable soil conditions.