生菜球疾病采取預防措施。1）選擇適宜的播種期，熟悉對外界環(huán)境條件——溫度的要求，然后算好播種期，設法讓結球期躲避高溫季節(jié)，使結球期處于白天溫暖夜間涼爽的時期。若結球期遇上日平均氣溫超過24℃以上的高溫時，可適當采取蓋遮陽網(wǎng)或蔭棚降溫等措施，與高稈作物或架菜間作，地面覆草，也是克服高溫措施之一，可結合采用。2）水肥均勻 定植后，前期結合澆水分期追肥并進行中耕，使土壤見干見濕，促進根系擴展及蓮座葉的生長。中、后期要不斷地均勻供應水分，以保持蓮座葉不衰和葉球迅速抱合生長，形成形狀正常、緊實的葉球。3）當葉球緊實時就及時采收，過早采收影響產(chǎn)量，采收過遲葉球內(nèi)短縮莖伸長，葉球變松，降低品質。

Take preventive measures against lettuce ball disease. 1) select the appropriate sowing time, be familiar with the requirements of the external environment conditions - temperature, and then calculate the sowing time, try to avoid the high temperature season, so that the ball period is in a warm day and cool night period. If the average daily temperature is higher than 24 ℃ in the period of heading, measures such as sunshade or shade can be taken properly, intercropping with high stalk crops or vegetables, covering the ground with grass, which is also one of the measures to overcome the high temperature. It can be used in combination. 2) after the uniform planting of water and fertilizer, in the early stage, combined with watering and fertilizing by stages, the soil will be dry and wet, and the root system expansion and the growth of lotus leaves will be promoted. In the middle and later stage, the water should be supplied evenly to keep the lotus leaves and the leaf balls growing rapidly, forming the normal and compact leaf balls. 3) when the leaf ball is tight, it should be harvested in time. Early harvest will affect the yield. If the harvest is too late, the stem will be shortened and elongated, the leaf ball will become loose, and the quality will be reduced.

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