症状：日灼病主要发生在果实向阳面，是由于强光照射引起的生理病害。发病初期被太阳晒成灰白色或浅白色革质状，病部表皮变薄，组织坏死发硬，后期易受炭疽病菌或腐生菌侵染。脐腐病主要危害果实，初呈暗绿色水渍状斑点，后迅速扩大至直径为2—3厘米的病斑，有时可扩至近半个果实。病斑皱缩凹陷，常伴随腐生菌侵染而呈褐色或黑色，通常内部果肉变黑但不变软，但有时被软腐细菌侵染时也引起软腐。

病因：日灼病和脐腐病均属生理病害。日灼病主要是果实局部受热，灼伤表皮细胞引起的，一般叶片遮阴不好，土壤缺水或天气干热过度，雨后暴热，均易引致此病。脐腐病在高温干旱条件下易发                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     生，植株进入盛果期，水分供应失常是诱发此病的主要原因。但也有认为植株不能从土壤中吸取足够的钙，致使果实脐部细胞生理紊乱，失去持水能力而发病。此外，土壤中氮肥过多，营养生长过旺，果实不能补钙也会发病。

防治方法：1、用地膜覆盖可保持土壤水分相对稳定，并能减少土壤中钙质等营养物质的淋失。2、要掌握适时灌水，尤其在进入结果期后，要均匀浇水，防止高温危害。浇水以在上午9时至10时为宜。3、合理密植，有条件的在高温季节可采用遮阳设施，避免果实直接暴露在阳光下。4、根外追肥，在坐果期特别是进入盛果期喷施1%过磷酸钙，或0.1%氯化钙，隔7天左右1次，连续喷施3—4次。