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益智生长要求有80%左右的阴蔽度。由于益智长期生长在这种阴蔽度大的环境里,叶表面比较细嫩,一旦受到太强的阳光照射,就会引起日烧病。据我们对兴隆华侨农场附近山区野生益智调查,在高大林木进行自然更新期间,阴蔽度达不到80%的地方,野生益智日烧病发病率也为0.5—1%。人工栽培的益智,阴蔽度较差,因此日烧病发生就极为普遍。根据近几年来在陵水县、万宁县等产区的调查,发病率都在20—30%,甚至达70—9O%,严重的造成死亡。
Puzzle growth requires about 80% of the degree of shade. Due to the long-term growth of puzzle in this shade environment, the leaf surface is relatively delicate, once too much sunlight, it will cause Japan burn disease. According to our investigation of the wild mountain near Xinglong overseas Chinese farms, during the period of natural regeneration of tall trees, the shade degree reached less than 80%, and the incidence rate of wild puzzle day was also 0.5-1%. Artificial cultivation puzzle, poor visibility, so the occurrence of the burn disease is extremely common. According to the surveys conducted in Lingshui County and Wanning County in recent years, the incidence rates are both 20-30% and even 70-9%, causing serious deaths.