The leaf larvae of Cnaphalocrocis medinalis are divided into five instars, and there are obvious differences in the damage of leaves caused by larvae of different ages. Therefore, in turn, the larvae in which the larvae are infested may be identified from the culprits on the leaves. According to the culprits at different ages, they may be divided into five corresponding periods according to the size of the period: One is the “white point period. The second age is called the "tip period", the third age is called the "vertical period", the fourth age is the "transition period", and the fifth age is the "gluttonous period." Specific hazard symptoms:
One-year-old: 2-3 days after the peak period of the moth, when the rice is in the tillering stage, carefully check the heart of the rice plant and the young leaf sheath, if the needle size, translucent white spots, and the uncovered scab, are found Can find 2-3 gregarious larvae, which are first-instar larvae.
2nd Age: In the 3-5 cm radius of the green-green rice leaves or leaves, there is a bundle of folded insects, which are 2 to 4.5 cm long. The silkworms are fresh, shiny, and have a larva. , Suddenly drooping drooping, the leaves have a distinct length of white strips, and light green, more humid, coarse powder insects, which is second-instar larvae.
Ingredient 3: Intensity-enhanced leaves were made as vertical stripe insects 13 to 16 cm long. The insects were wrapped with transparent insects. The two ends of the insects were open. There were white strips parallel to the leaf veins in the condyle, and there were more moist feces. There is a larva in the third instar larvae.
Four instars: Insects are 15-18 cm long, most of the green part of the quail is eaten, showing white leaves, twisting, leaves dehydration, dryness, insect granules, dry shrink, most of the worms can not find worms, and Transfer it and make another new one. This is the result of fourth-instar larvae.
Fifth instar: Insect size is similar to that of fourth instar larvae, but the green part of the pods is lost. The leaves are white and dry, thin, longitudinal, pale in insects, dry and powdery, and have no insects. Move to escape, this is the fifth instar larvae.
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