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今接到河南焦海勤的来信反映：在每年７、８月的高温季节番茄常出现一种被称为“换头”的现象，严重影响番茄的正常生长。其症状是在靠近生长点下出现一条纵向的裂缝，严重时里面出现空洞，缝中有时为褐色。而在靠近生长点附近的侧枝变短粗、坚硬。裂缝出现后植株生长不良，靠
The letter I received from Henan Jiao Haiqin today reflects that a phenomenon called “exchanging head” often occurs in tomatoes in the hot season of July and August each year, which seriously affects the normal growth of the tomato. The symptom is that there is a longitudinal crack near the growth point, and in the worst case, there is a cavity with a brown color in the seam. And in the vicinity of the growth point near the branches become shorter, hard. After the emergence of cracks poor plant growth, by