2,4-Dibutyl ester is used to control broad-leaved weeds (dicotyledons) in gramineous crop fields, and flax is a broad-leaved plant (dicotyledons), which is sensitive to 2,4-Dibutyl ester and cannot be used.
72% 2,4-Dibutyl EC can control broad-leaved weeds in wheat fields, such as Descurainia sophia, Capsella bursa-pastoris, Chenopodium album, Polygonum hydropiper, Anemarrhena asphodeloides, Lycopodium, Ixeris sonchifolia, and Convolvularia japonica, but its control effect is poor. Appropriate application period and dosage: during the wheat turning green, 40-50ml of 72% 2,4-butyl ester EC and 25-30kg of water should be used per mu. 2,4-Dibutyl EC can be mixed with paraquat and bromoxynil. And the dosage is reduced by half, thus expanding the weeding spectrum. It should be noted that1.2,4-d butyl ester is highly volatile, and drug droplets can float far away in the air, causing harm to sensitive plants. Dicotyledonous crops, such as spinach, beans, cotton, rape and sunflower, which grow together with cereal crops are very sensitive to it, which is one of the main reasons for the phytotoxicity of broadleaf crops in China. Therefore, the application should be carried out in windless or windy weather, and it is best to put a protective cover on the sprayer nozzle to prevent the drug droplets from floating into the dicotyledonous crop field. This medicine is not suitable for interplanting sensitive crops in wheat fields. 2. Strictly control the application period and dosage. Wheat is sensitive to 2, 4, 4- d-butyl ester before 3 leaves and after jointing stage, and it is easy to cause wheat phytotoxicity by using drugs at this time. The symptoms of phytotoxicity did not appear until after the heading stage of wheat. When light wheat heads, it shows that the wheat ears are bent and not easy to be pulled out from the flag leaves, showing a "crane head" shape. In severe cases, the ears of wheat are deformed and become "square-headed" ears. Therefore, the drug should be applied after the three-leaf stage and before the jointing stage of wheat. 3. The equipment for subpackaging and spraying 2,4-butyl ester should be dedicated to avoid "secondary pollution".