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１病害除虫菊萎缩病 (ＤｉｐｌｏｄｉａｃｈｒｙｓａｎｔｈｅｍｅｌｌａＩｋａ ｔａ)最早于１９１６年发生于日本冈山县 ,以后逐年扩大 ;本病在除虫菊整个生育期中均有发生 ,尤以４ -５月当花梗将抽出时如遇降雨 ,发生就极为严重。可以说 ,降雨量及菌源往往决定该病的严重度。
1 disease pyrethrum atrophy (Diplodia chrysanthemella Ika ta) first occurred in Okayama Prefecture in Japan in 1916, and then gradually expanded; the disease occurred in the pyrethrum throughout the reproductive period, especially in April-May when the peduncle will be out in case of rainfall, It happened very seriously. It can be said that rainfall and bacteria often determine the severity of the disease.