1. Cucumber grower: Since March, outside temperatures have gradually increased, the weather has warmed, and seedlings have grown faster. The maximum temperature in the nursery greenhouse can reach 30°C during the day and the temperature at night is not below 20°C. The growers water again. Relatively diligent and unreasonable, causing the cucumber seedling stems slender, slender internodes, larger leaves, tender seedlings.
2. Leaffly Hazards: In the greenhouse of cucumber seedlings, the surface of cucumber seedlings is covered with many unknown white spots. Unlike diseases, after careful investigation on the scene, many leafminers have appeared around the cucumber seedlings. After identification, the white spots are identified. For the adult of the leaf miner, it sucks and sucks the plant juice to suck it.
Prevention:
1. Control cucumber seedlings growers: to maintain the night before the bed temperature is 15-20 °C, about 10-15 °C in the latter half of the night, not less than 5 °C in the morning, the day is not higher than 25 °C, maintain a certain temperature difference between day and night, increase ventilation With light transmission, strict control of water and fertilizer, so that less water or not watering. For leggy seedlings that occur some time before planting, they can be planted deeper at the time of colonization and keep the cotyledons at 2.0-2.5 cm above the soil surface. It is not recommended to use phytohormones, especially if the paclobutrazol concentration is not good enough to cause phytotoxicity, chlorpyrifos and love. B9 and other plant growth regulators are also used as little as possible, insisting on physical control.
2. Control of leaf miner: 0.5% of avermectin powder 2000 times liquid spray, spray twice. Take care not to spray the seedling leaves to prevent phytotoxicity.
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