Yellow rice stem borer (Scirpophaga incertula ,pyralidae,lepidioptera)

Damaging stage :- caterpillar

Damaging symptoms :-

• dead heart(death of terminal shoot of vegetative stage )
• white head(reproductive stage of rice)
• tiny hole on stem and tiller of rice.

Identification

• Egg :- tip margin of leaf parts in dorsal parts
• Larvae :-yellowish white with brown head where as strip on the body and dark head in striped borer(chilo partelus ) while in pink head in pink borer( sesamia infrens).
• Pupa :- found inside the steam
• Adult :- female :forewings are yellow with two dark spot ,                                              male :forewings are brown color with dark spot .

Life cycle ;-

Egg –1 week–> larvae–3-6 weeks –> Pupa –1-2 week —> Adult

Management :

• Trichogramma chilonsis (egg parasitoid)
• Bacillus thuringenesis (dipel, biolep)@3g/l at evening hr .
• Napier grass/elephant grass as a catch crop
• Sudan grass –trap crop
• Sliver lea (desmodium uncinatum)-commercial legumes when intercropped with maize ,repel ovipositing stem borer.