Rice is native to tropical Asia and has been widely spread in China since it was widely planted in China. Understanding rice pests and diseases is very important for rice planting management. Now let's take a look at the rice pests and common sense questions and answers!
1. Where is the egg mass of rice stem borer?
A: Adults (mops) produce egg masses at the tip of the leaves at the front of the rice tillering stage. After the jointing of the rice round rods, they are prolific on the leaves of the 2-3 inches from the water surface, each with about 70-80 eggs.
2. What is the living habit of rice stem borer larvae?
Answer: Many larvae of the first larvae of the mites are harmed in the leaf sheath, causing the stalk; after 2 to 3 years of age, the stalks of the stalks are scattered, and one larva can damage 8 to 10; the larvae of the larvae are at the base of the stem or the sheath of the stem. Interspersed.
3. What are the methods to control rice stem borer?
A: Master the period of application, generally 3 to 5 days after the peak of hatching eggs, or when the first time the dead sheath is seen, the young larvae (1 to 2 years old) larvae kill 30 to 35 grams per acre. 50 kg of water. It can also be used for comprehensive prevention and control measures such as mercury lamp moth, artificial egg collection, white ear cutting, watering and killing, adult worming and root excavation.
4. How many generations did the dioxin appear in a year?
A: The stem borer occurs in China for 1-5 generations a year. The Huanghuai River Basin is 2 generations per year, 2 to 3 generations in the Yangtze River Basin, and 4 to 5 generations in South China and Hainan. In the Yangtze River Basin, the first generation of Chilo suppressalis occurred from mid-May to late June, and the second generation of Chilo suppressalis occurred in early July. The period from late July to late August was the main period of damage. Second generation.
5. How is the difference between rice stem borer and three generations?
A: The front wing of the female moth is slightly yellow, with a small black spot. The male moth has a light gray-brown front, a small black dot in the center, and a dark brown twill. There are 7 small black spots on the outside of the twill. The male and female moths of the stem borer are gray or taupe with no black spots.
6. Where does the female larvae of rice mites generally produce eggs?
A: Female moths usually produce egg masses at 6-10 mm from the tip of the leaf, or on the opposite side of the 24 leaves at the periphery of the rice. Generally, there are too many nitrogen fertilizers, and the growth is green and dense, and the amount of eggs laid in the rice fields in the tillering, booting to off-earning stage is large.
7. Why do you want to seize the fighters?
A: The newly hatched larva first climbs to the tip of the leaf, then squirts and falls, and drifts with the wind until the surrounding rice plant drills into the stem. The key is that the larvae can only be grasped for 30-50 minutes from hatching to drilling into the stem. Medicine time.
8. Is the nymph a larva?
A: There are four periods of eggs, larvae, pupa and adults in the life history of insects. However, some insects have incomplete metamorphosis in their life history, and only three periods of eggs, nymphs, and adults have emerged, such as locusts and mites. The eggs hatch out are nymphs. The characteristics of the adults gradually appear with the growth and development of the nymphs. They do not pass through the flood season, but the wings and reproductive organs of the nymphs are not fully developed.
9. What are the three main species of rice planthopper?
A: There are three species of rice planthopper, brown planthopper, white-backed planthopper and gray planthopper.
10. Why is rice planthopper a migratory pest?
A: Rice planthoppers generally winter in warm tropical climates such as Guangdong, Hainan, Vietnam, and Thailand. From March to May each year, they gradually migrate from south to north with southwest warm and humid airflow. The Pearl River Basin moved to the Yangtze River Basin in mid-July and moved to the Jianghuai and Huaibei areas from late July to late August. From late August to late September, it gradually moved southward with the southward airflow. Therefore, rice planthopper is a migratory pest.
11. What are the characteristics of rice planthoppers in the middle and lower reaches of the Yangtze River?
A: The three kinds of locusts are mixed in June to the end of September. Generally, the early rice in June is mainly gray-flying locusts, and the white-backed locusts are mainly in the period from July to August, and the brown planthoppers are mainly in the period from August to September. The prevention and treatment focuses on the upper sentence from late July to September and lasts until the end of September.
12. What is the living habit of rice planthopper?
A: In addition to moving south to fly over the winter, the south of the Yangtze River can also nymphs overwinter on weeds. Adults generally prefer to lay eggs in the lower sheath or stem of the yarrow. After the eggs hatch, if the insects move to the rice plants, the adults and nymphs gather in the base of the rice bushes, and the needles are pierced into the stems for feeding, which often causes the lower part of the rice plants to turn black, rot and smell, and fall down, resulting in reduced yield or Lost.
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