First, the application period Bordeaux liquid is a protective fungicide, should be used before the onset of fruit trees, the effect after the onset is not very satisfactory. It is not suitable to apply the apple tree within one month after the flower falls and the fruit is near the maturity stage. If necessary, some organic fungicides such as carbendazim and methyl thiophanate may be sprayed.
2. According to different tree species and different varieties, different kinds of apples, pears and other tree species sensitive to copper ions should be used. Double or multi-type Bordeaux mixture should be used; peach, apricot and plum are more sensitive to copper ions. Tree species, do not apply Bordeaux mixture; vines sensitive to calcium ions and susceptible to phytotoxicity, should reduce the amount of lime, can apply half or a small amount of Bordeaux mixture.
Third, pay attention to the impact of climatic conditions Spraying Bordeaux mixture should be carried out in clear weather without dew, not sprayed when the dew is not dry and rainy days. Cool summer spray should avoid the hot sun in the afternoon, and increase the amount of lime as appropriate during the rainy season.
Fourth, a reasonable mix of Bordeaux mixture can not be mixed with stone sulfur mixture, thiram, bacteriophage, cypermethrin and so on. If the Bordeaux mixture is sprayed, it must be separated by 20-30 days to spray the sulphur sulphur mixture; after spraying the sulphur mixture, it is necessary to spray the Bordeaux mixture at least 10 days apart.
Author: Zhaihong Min
Source: Shandong Science and Technology Information News
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