| 摘要: |
| 梨黑心粒遼西梨區的秋子梨上普遍發生,嚴重時減產七、八成,為害甚大。該病的症狀特徵為果心變黑,開花後一個月以後病果逐漸脫落,殘存者生勢惡劣,作"木梨"狀。調查資料顯示該病係由於花期遭受凍害所致。 |
| 关键词: 秋子梨 果心 黑心 受害 花期 |
| DOI： |
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| "BLACK HEART"OF PEAR |
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| Abstract: |
| "Black heart" of pear is an important disease of "Chu-Chi-Li" (Pyrus ussuriensis Mixim) in South Manchuria and it usually causes 70-80% loss in epidemic years. The chief diagnostic feature of this disease is blackening of the "fruit heart" and its main effect is early dropping of fruits. From the evidence observed in orchard and the rusults studied in laboratory, the writers are of the opinion that this disease seems to be caused by low temperature injury prevailing during the flowering period of fruit tree... |
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