In recent years, farmers have faced a growing problem: mysterious weeds are appearing in greenhouses, and once they take root, they're hard to get rid of. These weeds are commonly referred to as "grass." But why the name? It's because of the small yellow flowers they produce. After flowering, each plant develops five pods. The seeds are tiny, flat, and reddish-brown. When mature, the fruit splits open along its back, and the seed is launched outward by mechanical force—like a jumping bean. This unique dispersal method makes them spread quickly, which is why they're called "grass."
In reality, this weed found in greenhouses is known as *Oxycaryum* or *shamrock*, and it belongs to the Oxymoraceae family under the class Rosidae. It's a perennial herb that blooms from May to August and fruits from June to September. Shamrock spreads both through its roots and by seeds, and since the seeds are small and numerous, it's extremely difficult to remove manually. If chemical control is used, safety for tomato plants must be the top priority, followed by effective management of the weed.
After extensive research and testing, it has been found that DuPont Baocheng can effectively control shamrock in tomato fields, with similar results observed in eggplants and peppers. DuPont Baocheng is a post-emergence herbicide suitable for crops like corn, tobacco, potatoes, and tomatoes. It targets annual grasses, sedges, and broadleaf weeds such as shamrock, crabgrass, green foxtail, barnyard grass, mallow, chickweed, mustard, purslane, watercress, field bindweed, volunteer wheat, wild oats, and thorn apple.
When applying DuPont Baocheng, it should be sprayed when the tomato plants reach about 30 cm in height. A dilution of 6,000 to 8,000 times is recommended, and it effectively kills shamrocks and other weeds without harming the tomato plants. However, care must be taken during application. The sprayer should be positioned below the growth point of the tomato plants, ensuring the solution covers the space between rows evenly. Direct spraying on the growing tip should be avoided.
Additionally, it’s important not to use organophosphate insecticides within seven days before or after applying the herbicide, as this could lead to phytotoxicity. Proper timing and technique are essential to ensure the safety of the crop while effectively managing these persistent weeds.
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