柑橘果树在生长发育过程中,受某些外界环境条件的影响,会出现壮果期落果的现象。中期落果主要由非侵染性病害引起,如裂果病、日灼病等。为此,防止中期落果是柑橘栽培品种急需解决的问题。首先要了解裂果病、日灼病的症状和发病规律。一、裂果病。果肉迅速膨大,果皮被胀裂。在全国各地普遍发生,是柑橘果实生长发育中重要的生理病害之一。一般在8～10月 Citrus fruit trees in the process of growth and development, subject to certain external environmental conditions, there will be fruit drop fruit phenomenon. Mid-term fruit drop is mainly caused by non-invasive diseases, such as split fruit disease, sunburn and so on. To this end, to prevent mid-term fruit drop citrus cultivars urgently need to solve the problem. First of all to understand the split fruit disease, the symptoms and incidence of sunburn law. First, split fruit disease. Flesh rapidly swollen, peel was cracked. It is common in all parts of the country and is one of the important physiological diseases in the growth and development of citrus fruit. Generally in 8 to October