Differentia diagnosis of cucumber leaves in greenhouses

In the greenhouse, the leaves of the normal plants during the fruiting period were thick and flat, with deep nicks and pointed apexes, and vice versa. The types and causes of leaf anomalies are described below.

1, the blade is large, thin, round, shallow notch, petiole length, the angle between the petiole and stem is less than 45, the angle between the blade and the petiole is large. The reason is that the night temperature is high, especially in the latter part of the night, the temperature is high, the water is high, the nitrogen is filled, and the light is weak.

2. The angle between the petiole and the stem is large, the angle between the leaf blade and the petiole is small, the leaf blade is drooping, the petiole is short, and the leaf is dark in color. The reason is the low temperature and lack of water.

3, large leaves, swollen leaves, transverse diameter greater than vertical diameter, leaf margin curled backward, thick veins, pale. The reason is that the temperature is low and the soil moisture is high.

4, leaf color light green, thin leaves, long leaves, leaves stretch uneven, slightly spoon-shaped, petiole specialty, sagging, brittle or longitudinal cracking, easy to break. The reason is that the temperature is high and the soil moisture is high.

5, small leaves, dark green color, slow growth, leaf blade apex tipped or twisted to one side like virus symptoms, stem segments are also short. The reason is that the temperature is low and the soil moisture is low.

6, the blade is large, the tip does not stretch, the color yellow and green dull, sometimes there are yellow-green circles around the leaf edge, stem top growth is not smooth. The reason is that the temperature is high and the soil is dry.

7. The leaf margins of the upper and middle leaves are neatly gilded. The mesophyll tissues are generally not necrotic and the upper leaves become smaller suddenly. Some of the leaf margins are revolute in a parachute-like shape, the leaves are dark green, the growth points are tight, and the roots are rust-colored. Tip blunt. The reason for this is excessive fertilizer and excessive concentration of soil solution.

8. Yellowing of leaves or veins between leaves, and then dry, while the veins are still green, the boundaries between diseased and healthy parts are clear. The cause is ammonia poisoning.

9. In the early morning, the edge of the leaves resembles a water scald. The leaves have polygonal or dot-like water stains that return to normal after sunrise. The reason for this is that the protected area is closed for too long, the ventilation is insufficient, the ground temperature is high, the temperature is low, the humidity is high, the leaf transpiration is inhibited, the leaf cells are saturated with water, and the water flows between human cells.

10. The yellow leaves of the lower part of the early stage turn white and fall off, and the plants grow slowly. The reason is that the temperature is too low.

11, young leaves shrink, yellow leaves; appear "Netherlands celery leaves" shaped deformed leaves, also known as "acidic viral disease." The reason is that the pH value of the soil is too low, the acidity is too strong, or too much organic fertilizer is applied.

12, pale yellow leaves become pale, even white, thin stems, crisp. The reason is the lack of nitrogen.

13, leaf is bronze, the main vein sinks, especially the older leaves suffer more. The reason is the lack of potassium.

14. The growth of young leaves is not normal, the buds are clustered and the growth is inhibited. The reason is zinc deficiency.

15. The leaf margins of young leaves turn red first and gradually expand to the inside. White and transparent rot spots appear between the veins. In severe cases, most interveinal veins are chlorotic, the veins are still green; the plants are dwarfed, the internodes are short, the top is heavier, and tender The leaves are rolled upwards, the old leaves are bent downwards, and finally the plants gradually die from top to bottom. The flower is yellow-white and the melon is small and odorless. The cause is calcium deficiency.

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