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Rice leaf rollerwater pest, rice pest
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rice leaf roller adult
+ rice leaf roller is sucking on a chrysanthème sauvage.
Rice leaf roller
lepidoptera pyralidae

О Scientific name : Cnaphalocrocis medinalis (Guenee)
О English name : Rice leaf roller
О Size : the length of audlt's wings are around 18 mm 
О Host : rice, barley, wheat
О Distribution : Korea, Japan, China, Taiwan, India, Australia, New Guinea, the southeast Asia and more. 
 
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late-instar rice leaf roller larva 
The length of wings are around 18 mm. Rice leaf roller's head is white yellow and its body is brown yellow. The color of front wings are yellow and its front hem is covered with something like brown scales powder. There is brown fur on the middle of front hem. The edge of front wings are dark brown. 
 
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early-instar rice leaf roller larva
According to the recent research, the rice leaf roller came to Korea from abroad. The number of occurrence and damage are different every year.It is not sure weather the insect stays over the coldest season or not. It is considered to appear the second to third generation in a year.  The adult insect stays while putting its belly edge high between rice leaves or weed in day time and it spawns or mates after sunset. Moreover, it is phototaxis. Its egg is flat and oval. The rice leaf roller spawns 1 ~ 2 eggs on the rice leaf. The scattering period is 5~7 days, the period of larva is around 20 days and the period of pupa is 8~15 days. The lifespan of  moth is 9~20 days.
 
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early damage by rice leaf roller larva
+ it rolls 2 ~ 3 leaves and eat it inside of the leaves
Its larva is green yellow and when it grows up it turns to red slowly. Generally, rice leaf roller damages the crop after it rolls rice leaf vertically one by one and it files several parts.  However, sometime it files 2~3 leaves together and damage it.  The damaged leaf is left with only its epidermis and the insect moves to another leaf if the damaged leaf withered. You will be unable to see green rice in the rice paddy and rice's ear and grain filling become abnormal, if the damage by rice leaf roller is the worst. Rice leaf roller is similar with Cnaphalocrocis exigua but it does not cover the rolled leaf up and down and its larva tends to fall down quickly if you touch it. 
 
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the front view of damaged crops by rice leaf roller

 Translated by Sunyoung Cho

Other articles by Teokgi ParkInterviewed on : 2016.11.05 01:54

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#insect#lepidoptera#pyralidae#rice pest#rice

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