Abstract:

The disease of fruit cracking was one of the most serious disease that Myrica rubra ‘Dongkui’ was suffered from. The object of the research was to investigated and clarify the cause of the disease, in order to reduce the cracking rate and the relative complications. Content of the mineral elements in soil and leaf, such as Mg, Fe, K; as well as the plant growth regulators, including paclobutrazol and uniconazole were detected. In production, a lot of measures were taken, for example, stopping using paclobutrazol, doing rational fertilization and pruning, creating microclimate through regulating orchard humidity, to reach this achievement. The disease of cracking included apocarp cracking and putamina cracking. The apocarp cracking included longitudinal split and transverse split, and the former was more serious. The cracking rate was usually around 10%, however, sometimes it reached 20%. In the meanwhile, some complications such as fruit dropping and rotting were occurred, leading to more than 30% fruit rotting rate. Through studying on the pathogenesis with several years, the researcher thought that the main reason was endogenous hormone disorder. At the same time, improper cultivation, different varieties, mineral disorder, extremely dry or wet weather were also the important reasons. Fruit cracking disease was a kind of physiological disease. it was also relevant with hereditary feature. It can control and reduce by changing the method of cultivation, and pruning reasonably.