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系统调查研究了１９８８年５月１～７日连续７天出现异常高温热害对柑桔生产的影响。温州蜜柑在高温后的１０天内花果脱落率达９８．６４％，脐橙为２３．６３％，锦橙为３７．０７％，结论认为５月平均温度超过２５℃连续３天以上、绝对高温３０～３８℃、湿度低于７０％且雨量在２５ｍｍ以下，便会引起柑桔花蕾速开早谢萎蔫和幼果大量脱落。在高温到来前后迅速在树冠喷布植物细胞分裂素、助壮素、Ｐ５１、２，４－Ｄ、ＧＡ３等激素都能提高着果率。
A systematic investigation was conducted to investigate the effects of abnormally high temperature thermal damage on the production of citrus for seven consecutive days from May 1 to May 7, 1988. The rate of peach exfoliation was 98.64%, navel orange was 23.63% and orange was 37.07% within 10 days after high temperature, the conclusion was that the average temperature in May exceeded 25 ℃ for more than 3 consecutive days and the absolute temperature was 30 ~ 38 ℃, the humidity is lower than 70% and the rainfall is below 25mm, it will cause citrus flower buds to open early withered leaves and young fruit a lot of shedding. Before and after the advent of high temperatures in the canopy spray plant cytokinin, mepiquat chloride, P51, 2, 4-D, GA3 and other hormones can improve the fruit rate.