Raising seedlings of Hami Melon in Autumn

1. Sowing seeds

Hami melon varieties with high yield and high quality which are suitable for cultivation in Shanghai should be selected at the end of July and the beginning of August in Shanghai. Hami melon seeds were dried in an incubator at 40 ℃ for 24 hours, and then sterilized at 70 ℃ for 72 hours.

The seedlings are raised in a hole plate or nutrition bowl, with sterilized nutrient soil in it. Rice chaff: vermiculite: perlite: peat is 2: 1, 1: 1: 2, and mixed with sterilized organic fertilizer. It is appropriate to sow seeds in the evening. Before sowing, the nutritious soil should be disinfected with 5000 times of dimethazone solution. When sowing, poke a hole 1.5 cm ~ 2 cm deep on the nursery soil with your finger, sow 1 seed in each hole, put the seeds flat, and don't leave any space in the lower part. After sowing, cover with nutritious soil, and gently press with your hands. After sowing, cover the surface of the seedbed with a sunshade net to cool down.

2. Seedbed management

Under normal circumstances, the greenhouse is opened for ventilation. When more than half of the seeds are arched, remove the sunshade net as soon as possible when the temperature permits, let the seedlings receive light and prevent overgrowth, and cover the sunshade net properly to cool down the sun when it is hot at noon.

Watering should be in the early morning, the temperature in Shanghai is higher after 10 o'clock in the morning in autumn, and there should be no water droplets on the seedlings before that. After emergence, moisture should be controlled to prevent quenching disease and seedling growth, so that "dry and wet".

3. Pest control

Hami melon seedling stage is suitable for the occurrence of quenching disease, vertical blight and Fusarium wilt. If a small amount of diseased seedlings are found, they should be removed as soon as possible and sprayed with 75% chlorothalonil wettable powder 600 times, or 64% alum wettable powder 500 times, or 70% mancozeb wettable powder 500 times, generally sprayed once every 7 days. In the shed, ventilation should be maintained to reduce the relative humidity of the air in the shed, so as not to create suitable conditions for the occurrence of diseases.

The most common pests in Shanghai in autumn are Bemisia Tabaci, melon aphid, Liriomyza huidobrensis, melon borer, Spodoptera litura and red spider. To control Bemisia Tabaci, imidacloprid 2000 times, aphid 20% Mobilang EC 5000 times (20 grams per mu), Liriomyza huidobrensis 2000 times (710 grams per mu), 3500 times permethrin emulsion (30 grams per mu) and 2.5% fenvalerate EC 2000 times (50 grams per mu) are used to control Bemisia Tabaci. The control of red spider can choose 20% mike EC 1000 times (100g per mu). Pesticide application is generally carried out in the evening, it is not suitable to produce drug damage, the action time of the agent is long, and the control effect is good. Pest control facilities such as anti-insect net are installed around the greenhouse, which can effectively reduce insect pests at seedling stage.