In many places, leaf moths appeared 2-3 times higher than at the same time in previous years. Picture: Dinh Muoi.
According to the Hai Phong Ministry of Agriculture and Rural Development, the whole city has planted 27,588 hectares of rice in the spring of 2023. The weather in Hai Phong has alternated between sunny and rainy weather, favorable for the growth and development of rice teas. So far, the rice area has been estimated at 40%.
As a result of the elevation, the second generation of small leafrollers has bloomed and laid eggs on the rice teas, which are in the stage of differentiation – forming spikes, scattered flowers. The usual density of adult animals is 2 – 3 animals/m2, where the level is 7 – 10 animals/m2, and in places 30 – 50 animals/m2, which is many times higher than in the previous year.
For hatched worms, the density is usually 30-40 insects/m2 where the height is 80-100 insects/m2, and in some places it is 200-300 insects/m2, such as Vinh Quang Township, Hung Thang Township (District Tien Long). ). . As for the second generation, the density of the second generation this year is 2-3 times higher than in the same period in 2022.
The places with high egg and larva density such as Vinh Quang and Hung Thang Townships (Tien Lang District); Kenh Giang, Hoa Binh, Pha Le, Hoa Dong, Thien Huong, An Son, Chinh My Communes (Thuy Nguyen District); Tam Cuong, Hoa Binh, Cao Minh, Tien Phong, Dong Minh, Tran Duong (Vinh Bao District) communities; Dai Dong, Doan Xa, Ngu Phuc communities (Kien Thuy district); Bac Son, An Hoa and Tan Tien communities (An Duong district); Municipalities of Tan Vien, My Duc, Chien Thang (An Lao District)…
Leaf rollers cause serious damage in some areas. Picture: Dinh Muoi.
In the next period, the adult leafrollers continue to grow and lay eggs, the young caterpillars continue to hatch and increase their density in the field, causing damage to the cycads on rice tea at the stage of flowering differentiation and flowering.
In some rice fields currently blooming and flowering, there is a very high density of adults and eggs with dozens of adults/m2 and over 100 eggs/m2, hatching larvae cause damage to the leaves and affect the quality of the leaves – number of rice grains and the percentage of solid grains. If this area is not sprayed in time, it will directly affect the yield of spring rice in 2023.
In order to protect the spring rice harvest in 2023, the Ministry of Agriculture and Rural Development of Hai Phong sent a telegram to request district people’s committees to order the reinforcement of technical personnel, propagate and guide farmers to visit fields, pesticides to inspect and spray Small leaf rollers bloom on the entire rice field from 5.5.
Authorities recommend that people focus on spraying small leafrollers from May 6-10. Picture: Dinh Muoi.
Localities need to pay attention to the flowering rice areas – flowering, but have a high density of first litter, white leaves cause damage from the previous litter, focus on spraying insecticides with small leaf curlers with a density of 20 heads / m2 or more to protect the Sound.
For areas with a high density of hundreds of insects/m2, it is necessary to spray twice twice, spray twice after the first time of 4-5 days for almost 50% of the cultivated area. The spray timing is from May 6, 2023 to May 10, 2023.
People spray insecticides to roll small leaves according to the instructions of authorities, and then continue spraying against cotton collard disease on infected varieties such as glutinous rice, Dai Thong 8, BC15, TBR225, Khang Dan 18…
With a spraying time of 3-4 hours, it must be sprayed again when it rains, collect pesticide packaging after use and put it in the tank according to regulations. Absolutely do not use electricity to kill rats in any form.