症状　在番茄开花结果期 ,普遍大量落花、落果 ,严重时可造成第一花穗几乎全部脱落 ,第二穗花、果大部分脱落。发生原因　番茄落花落果属于生理性病害。发生原因主要有 :(1)生殖发育发生障碍。气温过低或过高 ,开花期多雨 ,都能影响花粉的萌发及生长 ,使受精不良。 (2 )营养不 Symptoms in tomato flowering period, generally a large number of falling flowers, falling fruit, can cause the first flower spikes almost all fall off, the second flower, fruit most of the fall. Occurrence causes fall flowers fall fruit is a physiological disease. The main causes are: (1) reproductive development disorders. The temperature is too low or too high, rainy flowering, pollen can affect the germination and growth, poor fertilization. (2) nutrition is not