What season is cucumber a vegetable of? Solutions for pesticide phytotoxicity
Cucumbers are crisp and tasty, and can be eaten raw or stir-fried, both ways taste very good, and they are deeply loved by consumers. Cucumber is also one of the foods favored by people who are losing weight, low in fat and highly satiating. Cucumbers are planted in all parts of our country. Let us take a look below at what season cucumber is a vegetable of? How should pesticide phytotoxicity from spraying be solved?
1. What season is cucumber a vegetable of?
What season cucumber is a vegetable of depends on when it is planted. Generally, if cucumbers are planted in spring, then the cucumbers mature around April or May, and cucumbers that mature in this season are called spring cucumbers. There is another kind of cucumber, autumn cucumber, which is generally chosen to be planted in autumn and can be harvested in September and October. This kind of cucumber grows with somewhat better quality than spring cucumbers, which is thanks to the relatively high temperatures during this period and the relatively abundant rainwater, which is exactly favorable to the growth of cucumbers.
2. How should pesticide phytotoxicity from spraying cucumbers be solved?
1. The prepared concentration is too high, or the amount of pesticide liquid sprayed is too much
When ethephon is commonly sprayed, either the concentration prepared is too high, or too much pesticide liquid is sprayed. When the phytotoxicity is mild, the cotyledons and the edges of the true leaves fade to green and yellow, and then dry up; the notches on the edges of the true leaves are noticeably reduced, and growth is inhibited to a certain extent. When the phytotoxicity is severe, the cotyledons or the true leaves that had already grown at the time of spraying have dry edges and show chlorotic whitish streaked spots, the notches become small, and the leaf edges tighten and curl toward the back in a parachute shape. The true leaves that appear afterward still have shallow or no notches, and growth is severely suppressed. If the phytotoxicity is mild, it can still recover through fertilizer and water management and spraying hormones. When the phytotoxicity is severe, recovery is extremely difficult, and although rescue measures such as spraying hormones are used, the effect is generally poor. In such cases, the emphasis is mostly on preparing new seedlings. When metalaxyl mancozeb is used at the seedling stage to drench the stems and irrigate the roots, symptoms of the tender stems being scorched will occur.
2. Misuse of pesticides to which cucumbers are allergic
Pesticides to which cucumbers are allergic include phoxim, 1605, and others. Some of these pesticides were already banned to begin with, or are banned on vegetables (such as 1605), and some are allergens to cucumbers and very easily cause phytotoxicity. The phytotoxicity caused by this is generally extremely difficult to remedy. When anti-drop agents and fruit-setting agents are used on plants that are growing leggy and cannot set fruit, the upper part will be noticeably shrunk and wrinkled, appearing like newly grown pea shoots and leaves.
3. Applying pesticides not according to regulations
What is commonly seen in production is spraying Bordeaux mixture or copper sulfate suspension concentrate under high temperatures, and more commonly phytotoxicity caused by mancozeb. Mancozeb under high temperatures, or when high temperatures are encountered after spraying, or when the concentration used is too high, very easily causes phytotoxicity, and the affected leaves generally appear shrunken and stiff, with a dark green leaf color. When mancozeb is used continuously, especially continuously under low temperatures, it often causes manganese excess disorder. Manganese excess disorder is also called brown leaf blight. First, the netted veins of the leaves turn brown, visually like rusty water soaking outward from within the leaf veins. When held up to sunlight, necrotic spots can be seen, and in severe cases the plant dies. When the manganese content in the leaves is too high, first the branch veins turn brown, then the main veins turn brown, and then as the manganese level becomes too high, the bristles on the leaf stalks also turn black, and the leaves dry up.