Currently, summer-autumn rice is at the beginning of the tillering stage, the main tea is 2-3 leaves, and the tea is late. Through reports of localities and inspection results of the Sub-Department of Cultivation and Plant Protection, in the fields many pests and diseases have arisen, especially the yellow apple snail appears in high density in most areas. all localities.
As of June 16, 2021, the area infected with yellow apple snails in the province is 315 hectares, of which: Quang Ninh 200 hectares, Ho Chi Minh City. Dong Hoi 35ha, Le Thuy 30ha, Quang Trach 17ha, Bo Trach 15ha, TX. Ba Don 8ha, Minh Hoa 7ha, Tuyen Hoa 3ha. The common density is 3-5 animals/m2, where 10-15 animals/m2 is high, 30-40 animals/m2 locally. Snails come in many sizes in the field.
Yellow apple snail appears in high density and damages summer-autumn rice. Mr. Le Xuan Tu, Director of the Sub-Department of Cultivation and Plant Protection said that the yellow apple snail harms the newly sown rice stage, greatly affecting the growth and development of rice plants, if high density can make 100% loss of trees in the field. In order to minimize the damage caused by yellow apple snail, farmers need to apply a combination of manual measures and chemical measures to increase the effectiveness of killing snails. When the density of snails is high, snails are small, in order to thoroughly limit harmful yellow apple snails, people use drugs with active ingredients, such as Metaldehyde, Niclosamide to eradicate. Dosage according to the manufacturer’s instructions on the packaging. People should note that when using the drug, it is necessary to maintain the water level from 3-5cm to prevent high efficiency; Spray in the early morning or late afternoon because this is the time when snails are most active. Pesticides to prevent snails are often toxic to aquatic animals, so they should only be used when the snail density is high, avoiding use in rice and fish fields. In addition, other objects are causing harm with an increasing trend, such as: rats harming 71.2 hectares, leaf rollers 60 hectares, acacia caterpillars 50.2 hectares, thrips 36 hectares…. The Sub-department recommends that farmers keep a close eye on the fields, closely monitor the situation of harmful effects, proactively implement timely and effective prevention measures.