What if the rice seedlings are yellow, curled leaves and curled hearts?

There are many reasons for the phenomenon of rice leaf curling, the most common of which is the rice leaf roller. Damage characteristics: the larvae longitudinally rolled rice leaves into insect bracts, and the larvae lived in it to feed on the mesophyll, leaving only the epidermis, forming white stripes, resulting in the decrease of rice 1000-grain weight, the increase of blighted grains and the decrease of rice yield.

Control agents: 1. Select insect-resistant rice varieties and apply fertilizer reasonably to make the rice grow healthily and prevent it from flourishing in the early stage and late ripening in the late stage. Manage water scientifically, properly adjust the shelving time, reduce the field humidity during the hatching period of larvae, or irrigate deep water for 2-3 days during the peak period of pupation to kill pupae. 2. Protect and utilize natural enemies. There are more than 80 species of natural enemies of Chilo suppressalis, and there are parasitic or predators in each stage. Parasitic natural enemies such as Trichogramma in egg stage, cocoon wasp in larval stage such as Chilo suppressalis, and predatory natural enemies such as spiders and frogs play an important role in controlling Chilo suppressalis. 3. Rice is vulnerable to Chilo suppressalis medinalis at tillering stage and panicle stage, so pesticide control should be adopted. The commonly used agents are: 18% insecticidal double sprinkler, insecticidal order, special killing borer, triazophos and so on.