What causes red leaves in large ginger? Detailed explanation of ginger cultivation techniques
Why do large ginger leaves turn red? Please explain the causes. In ginger fields, it has been found that quite a few large ginger leaves have turned red, and some even have red leaves along the entire stem. The lower old leaves are severely affected, gradually lessening toward the top. This situation is distributed in patches in the ginger field. Although the leaves have changed color, they remain very intact, with no disease...
Why do large ginger leaves turn red? Please explain the causes
In ginger fields, it has been found that quite a few large ginger leaves have turned red, and some even have red leaves along the entire stem. The lower old leaves are severely affected, gradually lessening toward the top. This situation is distributed in patches in the ginger field. Although the leaves have changed color, they remain very intact, with no disease spots appearing, and no disease spots were found at the stem base either. However, insect holes were found at the stem base near the soil surface, so the reddening of large ginger leaves may be caused by pests biting and feeding on the stems.
The pest that commonly harms ginger stems is the ginger stem borer, which vegetable growers usually call the "stem cutter." The larvae of the ginger stem borer bore into the ginger stem to feed, ultimately causing the stem to become hollow, which blocks the transport of water and nutrients, causing the large ginger leaves to change color and eventually wither and yellow. Once the ginger stem borer causes damage over a large area, it has a great impact on large ginger yield, so it should be a key target for control at present. Although some ginger growers use insecticides, they mix them with fungicides and only spray them on the upper leaves, so the middle and lower stems do not come into contact with the spray solution, making the middle and lower stems the key area of pest damage. The author suggests that vegetable growers use insecticides alone, choosing DuPont Coragen (5 ml/bag, mixed with 30 jin of water) plus an organosilicone adjuvant, diluting twice and focusing the spray on the middle and lower stems. It can also be mixed with emamectin benzoate to simultaneously kill adult pests and prevent them from laying eggs and reproducing on the upper part of the large ginger.
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