Wang Dengfu of Tianchang City, Anhui Province, said on December 24th that from December 1-5 on 500 to 600 mu of wheat in the 2- to 3-leaf stage, he used 7.4% of furfural oxime dispersible granules per acre for 24 grams. 50% Isoproturon WP 250g plus 30kg water spray. When the medicine was applied, the growth of the wheat seedlings was normal. There was frost on the 1st day after the medicine was applied, and after 1 week of medication, low temperature frost weather occurred. After the frost weather, the leaves of the wheat were dry and yellow after 2 to 3 days. In the field, the wheat seedlings at the site of heavy re-emergence suffered from heavy damage. The whole leaves were yellow and dry and accounted for 10% of the whole field wheat seedlings. The damaged wheat seedlings had only the heart of the heart blade green, and the other leaves chlorosis yellowed. He asked why the leaves of wheat appear yellow and dry.
Sulfisomamide is a stem and leaf treatment agent that can control wheat weeds, acorns, wild oats, barnyardgrass, leeks, and common weeds such as grass weeds and broad-leaved weeds. The drug is absorbed by weed leaves, leaf sheaths, stems and roots, accumulates at growth points, inhibits acetolactate synthase, fails to synthesize branched-chain amino acids, affects protein synthesis, affects weed cell division, and causes weeds to stop growing and yellowing. Then died. Dow Corning's 7.5% furfural water dispersible granules are registered for winter wheat stem and leaf spraying to control annual weeds. The recommended dosage per hectare is 10.55 to 14.06 grams, approximately 9.4 per acre. ~12.5 g. The activity of the drug is relatively high, and it is necessary to strictly follow the recommended dosage, application period and method, otherwise it is prone to phytotoxicity. More than 13.3 grams per acre, there is a clear phytotoxicity; more than 24.9 grams per acre, there will be a certain degree of production. The drug should not be applied before bad weather such as low temperature frost (lowest temperature below 2°C), and should not be applied to wheat fields suffering from smolt, frost damage, salt damage, disease, and malnutrition. Flooding should not be performed within two days before and after application. In order to avoid phytotoxicity.
Isoproturon combines the effects of soil sealing and stem and leaf treatments to control most grassy weeds and some broad-leaved weeds in wheat fields. Drugs are mainly absorbed through the roots of weeds, and are guided upward into the leaves with water in the ducts, inhibiting the photosynthesis of green plants. Weeds suffering from phytotoxicity show chlorosis and yellowing at the tips of the leaves and leaves, and finally die. 50% Isoproturon is used in wheat fields. Generally, 125-150 grams per mu is used. When the age is large, the amount of mu can be increased to 250 grams. The drug will reduce the cold resistance of the wheat seedlings. After the wheat field application, it will suffer from low temperature frost within a short period of time. The wheat seedlings are susceptible to freezing injury and appear as "frozen phytotoxicity." In general, the average daily temperature of 4~5°C will have a relatively heavy frost. If this type of weather occurs within half a month after the application of isoproturon, it may cause heavier damage to wheat. The wheat seedlings may appear chlorotic. Growth is inhibited. Severe frosts occurred shortly after application, and the wheat damage was even more serious.
According to weather information, Anhui Tianchang and other places have experienced two cooling processes since December 1. The first time occurred around the 3rd, with a minimum temperature of -1°C and a maximum temperature of 9°C; a second time on the 16th. Before and after, the minimum temperature is -3°C and the maximum temperature is 5°C.
In the wheat 2 to 3 leaf stage application of the above formulations weeding, in which a large amount of imidachlor is easy to cause damage to the wheat seedlings, the emergence of yellow leaves, growth inhibition and other symptoms, severe will cause dead seedlings. In addition, the occurrence of cryogenic frost weather within a short period of time after application will be subject to "isophorone" and further increase the toxicity symptoms of the insecticide. For the above-mentioned tainted wheat, sprayed with 0.136% erythrazine WP, humic acid and other fertilizers, can promote plant growth to a certain extent.
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