葡萄キヤンベル・アーリに対する石灰ボルドー液の薬害に関する研究-1-

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Campbell Early grapes in Kyushu have been suffered from early defoliation. In severe cases older leaves turn to yellow and bigin to fall from late June, and ultimately most of leaves fall off in July, leaving on lateral canes. A preliminary study in 1953, showed that the early defoliation is induced by Bordeaux sprays. In 1954, the authors conducted some experiments on the factors affecting the early defoliation of the Campell Early grapes, especially on the com-position of Bordeaux mixture. Experimental results revealed that the commonly used 4-2-100 mixture which have been recomme-nded as the formular for grapes, induced most severe defoliation. On the contrary, dilute and high-calcium mixture of 2. 4-4. 8-100 formular was most safe for the grapes, and induced no defoliation, while it was effective to control the fungus diseases. The Bordeaux injury development was accompanied with rainfall. Even the 4-2-100 mixture caused no defoliation when no rain falled.
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