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Cause of the disease: This is due to magnesium deficiency caused by excessive potassium, because in the soil when the potassium concentration is too high, it will affect the cucumber's absorption of magnesium, according to the relevant test proved that when the soil potassium and magnesium The ratio of 8:1 will cause magnesium deficiency, leading to the emergence of white mesh leaves.
Control methods: First of all, to balance the fertilization --- base fertilizer used to fully decompose the organic fertilizer, nitrogen, phosphorus, potassium and other fertilizer to be a reasonable application, especially phosphate fertilizer can not be too little. Then pay attention to the application of magnesium fertilizer - sand and sandy loam soil will generally lack of magnesium, it should strengthen the application of magnesium fertilizer, choose calcium magnesium phosphate fertilizer, magnesium ammonium phosphate fertilizer, etc.; also timely spraying 2% of the foliage Magnesium sulfate aqueous solution. 
Cucumber diseases a large inventory of cucumber leaves white net edge
The main symptoms of white leaves on the cucumber leaves: In the production of protected cucumbers, white mesh edges appeared in the upper and middle leaves of the plants, and symptoms began to emerge from the tips of the leaves, and developed along both edges of the leaves. When severe, it also develops toward the interior of the blade. The leaf margins are dry in the late stages.
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