There are certain similarities in these cases in production, and today I will make a simple distinction here.
Friends who have planted grapes must be no stranger to the transparent beads on this grape, which is a special structure formed by the secretions of grape plants, often referred to as "nutrient beads". They often appear on the leaf back, petiole, internodes, and ears of grapes.
The development process of the grape "nutrient beads"
Image source: Liu Tiantian
The "nutrient beads" are transparent like insect eggs at the beginning, and later they will shrink into small black protrusions, but this small protrusion is very easy to fall off.
In the "nutrient beads" water accounted for 90%, the content of phosphorus is the highest, in addition to containing elements such as copper, iron, boron, manganese, etc., grapes can use the phenomenon of external vomiting to remove excess nutrients in the plant to achieve the best growth state.
In addition to regulating the moisture and nutrients of the grape plants, some of the volatile components of the "nutrient beads" also have a certain anti-insect effect. For example, the volatile pinene in the "nutrient beads" of the red tip can have a certain avoidance effect on leafhoppers, inchworms, etc.
In addition, the lower part of the grape plant is exposed to weak light and poor ventilation, which will affect the transpiration effect, resulting in nutrient and water retention, so these places often secrete more "nutrient beads".
"Nutrient beads" is a normal physiological phenomenon, but too much for varieties with poor fruit setting such as Jufeng may not be a good thing, indicating that the tree is strong and will affect the quality of fruit set. For other varieties, too, if there are unusually many "nutrient beads" in grapes, it is necessary to adjust the fertilization scheme in time.
There are several phenomena in production that are distinguished by attention and nutrient beads:
1、
The small white dots on the fruit surface are raised, like the tip of the needle, which is not a nutrient bead, but the skin hole wood thrombosis caused by the excessive use of expansion agents such as thiobenzolyl, which is grown together with the peel and cannot be erased.
2, the shell insect secretion, this is very good to identify, can see the insect body.
3、
This is sugar-spilling mold spot disease, which has been common in the southern giant peaks and summer black in recent years. According to The Teacher Chao Wu disease: In 2005, it was found on the summer black that it was a mold isolated by pathogenic bacteria, especially in the summer black that was delayed harvest. This is mainly related to the abuse of hormones, making the skin pores larger, and the sugar extravasive. This situation also has a lot to do with the high humidity of the air, the use of large frame type, the result position is raised, pay attention to air circulation during the ripening period, do not make the orchard depressed.
Today's content is a little simpler, for these situations, welcome to leave a message to discuss.
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