How to manage high-yield, bumper harvest and sell high-priced winter strawberries

What happens to strawberries in the greenhouse in winter?

In strong winds, the shed film will swell with the wind and beat up and down. If it is not managed in time, the shed film will be blown and the strawberries in the shed will suffer freezing damage. All vents should be blocked tightly, the film line should be tightened, and a part of the grass thatch should be put down to press the film firmly. If there is a strong wind at night, it is necessary to use a woven bag with half a bag of soil to press part of the grass thatch to prevent it from being blown off by the wind.

In snowfall, the grass thatch will get soaked, which will affect the heat preservation, the grass thatch is difficult to roll, and easy to collapse. The snow on the grass thatch must be cleared in time, and the snow beside the shed wall must be removed to prevent the snow from melting through The mud seeped into the shed. Sweeping snow on the shed film during the day enhances the light transmittance of the shed. In order to increase the temperature and prevent freezing, small arches can also be buckled in the shed. The grass thatch can't be fully exposed at one time, in case the sunshine turns to sunny after snow, and the sunshine will cause serious dehydration and permanent wilting of strawberries.

In case of cloudy and foggy weather, pay attention to increasing artificial auxiliary lighting. The incandescent lamp can be used as the light source for heating treatment. The heating is usually carried out at night, and ventilation is carried out for a short time around noon. The temperature in the shed during the day is around 20°C and the temperature at night is above 10°C. During the strawberry flowering period, pay attention to stocking bees for auxiliary pollination to increase the fruit setting rate and strawberry yield and quality. (Sun Zhi)

How to control strawberry red spider in greenhouse?

Red spiders are important pests in greenhouses and greenhouses. They usually use adult mites and nymphs to suck juice, spin silk, form nets, lay eggs and damage them on the back of strawberry leaves. The damage, the shrinking of the fruit, and the increase of deformed fruit, seriously affect the yield and quality of fresh strawberry fruit.

Prevention:

Isolation measures are taken to strictly control personnel entering and exiting the shed. Sterilizing pads are placed in front of the shed door, and work clothes are changed when entering the shed to block human transmission; operating tools are dedicated to the shed to avoid cross-spread.

Use natural enemies to control red spiders. In the early stage of occurrence, release predatory mites from flowering to fruit growth. Try to reduce the number of red spiders before releasing predatory mites. Use 1% matrine·azadirachtin or 10% abamectin water dispersible granules Agent for pest control.

Use biological pesticides for prevention and control, use 99% mineral oil to dilute 150-200 times with water for full-field spraying. After 3 to 5 days, you can spray the second time, or use 10% avermectin water dispersible granules 8000-10000 times Spraying, once every 7 days, the effect of alternate use of the two agents is better. (Zhang Yang)

Strawberry winter pipes in greenhouses need "two preventions"

Prevent early buds and early flowers

In winter, in order to prevent early buds and early flowering of strawberries, the following points should be done in the production: First, select the appropriate varieties. For greenhouse cultivation, select varieties with less dormancy. If you choose a variety with strong dormancy, the insulation and coverage should not be too early. The second is to fertilize reasonably, strengthen management, and cultivate strong seedlings in the process of raising seedlings. By removing old leaves, removing inflorescence, straightening out stolons, and spraying gibberellin, the management of mother plants is strengthened to produce high-quality and strong seedlings. The third is to pay attention to temperature control after the shed.

Anti-deformed fruit

Mixing some varieties with a lot of pollen among the main varieties is an effective measure to prevent strawberry deformities in greenhouses. Pesticides should not be sprayed during strawberry flowering period. Drugs can be used to prevent and control the disease before the strawberry blooms, and the diseased plant can be removed in time after the flower, and the diseased leaves and inflorescences can be removed to control the spread of the disease. When the moisture content is insufficient, the ridges should be irrigated in time with film mulching. When there is a shortage of fertilizer, apply 15 kg of 45% ternary compound fertilizer per mu with watering and do not use ammonium bicarbonate. After the fertilizer is diluted with water, the perforated topdressing effect is better. When each batch of flower buds of strawberry in the greenhouse is formed, put bees in the shed, and stock 5,000 in each standard shed, so that the pollination rate can reach 100%. The bee release time is 8-9 am and 3-4 pm.

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