There are many broad-leaved weeds in the rice field, such as duck tongue, chili, lilac, ghost needle grass, synthesis, water amaranth, etc., and sedge weeds mainly include heterogeneous sedge, broken rice sedge, water sedge, wild water chestnut, etc. The following is a compilation of several common weeds recently photographed and corresponding control methods, and other weeds will continue to be sorted out for your reference.
1. Duck tongue
Platypton is a plant of the family Lycaenaceae, with small seeds and a long dormancy period, generally growing 15-20 days after planting, and the optimal temperature for growth and development is 20-25 °C. The growth of duck tongue grass is large, shade-tolerant, and rice can continue to grow after being sealed, and the occurrence of large numbers will affect rice growth.
Prevention method: closed treatment before and after planting, benzylsulfuron, pyrsulfuron and their compound preparations can be selected. Stem and leaf treatment, you can choose 2 methyl 4 chlorodimethylamine salt, dimethyl chlorfen pine, chlorofluoropyridinate, etc., pay attention to drainage before application, so that weeds are exposed to the surface.
2. Triangular grass (sedge)
Triangular grass, a common name for sedge, is one of the three major weed species in rice fields, and the stem is often triangular. The main sedge species in southern rice fields were heterogeneous sedge, broken rice sedge, and water sedge, and the seedling stage heteromorphic sedge and broken rice sedge were similar and difficult to distinguish.
Prevention method: blocking treatment can choose to use benzylsulfuron, pyrisulfuron-containing blocking herbicide, direct field with benzylpyrichlor propylachlor, machine cutting, seedling field can be selected benzyl dice, benzylpyrimidine benzothiamoyl and other mixed fertilizer after the rice rejuvenation, the sealing effect is good. Stem and leaf treatment can be used after rice 3 leaves and 1 heart according to local conditions to choose 2 methyl 4 chlorodimethylamine salt, chlorpyridine pine, chlorpyrisulfuron, dimethyl chlorpyridone and other herbicides to control, such as 25 ml of stem and leaf spray treatment per mu, after the application of the sedge stem base quickly blackened, gradually withered and died. The sedge wax layer is thick, not easy to medicate, it is advisable to add additives such as lecithin and use sufficient water.
3. Water peanuts
On the side of rice roads and fields, water peanuts, also called hollow lotus grass, drought-loving lotus grass, and revolutionary grass, were originally introduced as fodder plants, with a large amount of grass, but the taste was not good, and it was abandoned. Water peanuts have strong reproductive ability, a little sunlight can grow crazy, the more sufficient the water and fertilizer, the faster it grows, becoming a flooded weed, whether farmland or water will be invaded by it, destroying biodiversity and the environment. The nutrient rhizome of water peanut is thick and deep, and it is difficult to completely prevent and remove the general biocidal herbicide, cutting the grass without removing the roots, and the spring breeze blows and grows, becoming one of the malignant weeds that are difficult to control.
Prevention method: chlorofluoropyroxyacetic acid can be used, once applied, harmless in one season, applied twice a year, can control the harm of water peanuts, and adhere to the use can eradicate it. For fields, non-arable land, orchards, you can use 20% chlorofluoropyroxyacetic acid 20 ml plus 80% glyphosate powder 45 g plus 10 ml of lecithin additive 10 ml a bucket of water spray; In rice fields and corn fields, you can use 20% chlorofluoropyroxyacetic acid isooctyl ester 20 ml plus 10 ml of lecithin additive 10 ml a bucket of water spray, which can be mixed with other herbicides and used together to expand the herbicidal spectrum.
4. Spicy butterfly
The plant is relatively tall, and the growth number will affect the rice yield. Common weeds in rice fields are water flies, acid mold leaf butterfly, red leaf butterfly, etc., commonly known as chili butterfly, horse butterfly, pepper grass, similar in shape but also different, such as the following 2 species, the back of the leaf has a white woolly layer is woolly acid mold leaf butterfly, the other should be red pepper leaf butterfly.
Prevention method: the applicable herbicides are pyrisulfuron, pyrisulfuron, pentaflumetrazine, chlorofluoropyridine, chlorofluoropyroxyacetic acid, chlorfluoxone, 2methyl chlorofluoropyroxyacetic acid, etc., first blocked, the first choice of benzylsulfuron, such as 35% benzylachlor, or pentaflumetrazine prochlor, pyrachlor, stem and leaf weeding should be selected according to the type of weed in the field, add lecithin additives to enhance the weeding effect, pay attention to the spray to be uniform.
5. Clove
The occurrence of cloves in rice fields has increased year by year, and in some areas it has become one of the main weeds, and the occurrence of large numbers will affect rice yield. Lilac is not a family of catastropods, but is a weed in the family Lanceolaceae with leaves similar to willow leaves, lanceolate, green or reddish-purple. Cloves emerge from May to August, with multiple grass peaks in rice fields, and the flowering and fruiting period is from July to October.
Prevention and elimination methods: First, closed treatment, direct broadcast field with benzylpyrachlor, pentafluoride propylpyramine, etc. for closed treatment, machine insertion or transplanting field with benzyl butane, pyrapyricity, phenylthiamoyl and other fertilizer spread closed. The second is stem and leaf treatment, 2 methyl 4 chloride, chlorfluoropyroxyacetic acid and other herbicides have a good prevention effect on clove butterfly, if the number of occurrences, plant height is large, it is advisable to use 2 methyl weed or use chlorofluoropyroxyacetic acid plus 2 methyl 4 chlorodimethylamine salt and other compound solutions to prevent, such as 65% 2 methyl 4 chlorodimethylamine salt 25 grams plus chlorofluoropyroxyacetic acid isocaprylate 20 ml a bucket of water.
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