Fall Armyworm (Spodoptera frugiperda) causes crop damage to larger extent in maize or corn.
Damage on Corn/Maize.
- Fall Armyworms usually feed at night and damage corn by chewing leaves. They prefer to feed on the succulent leaves in the whorl first.
- Feeding is usually confined to leaf margins, but occasionally they may strip the entire plant leaving only the midrib of the leaves.
- During the day, armyworms are found in the soil or underneath ground cover.
- Ragged leaf feeding in the spring and early summer is evidence of armyworm feeding.
Stages of Armyworm:
Egg: Eggs are small, greenish-white, globular, and laid in clusters of 25 or more on the leaves of grasses.
Larvae: The full-grown 1-1/2 inch armyworm has a greenish brown body with a thin stripe down the center and two orange stripes along each side. The head is brown with dark honeycombed markings.
Pupa : Pupal stage of armyworms is in soil.
Moths: The adult moth is tan with a tiny white spot in the center of the forewings. The moth has a wingspan of about 1-3/4 inches.
Integrated control measures need to be followed to control the fall army worm
The moths lay eggs at the base of leaves of any plants including the weeds in and around the main fields. The weeds need to be removed or weeds need to be sprayed with chemicals with ovicidal properties, so that the egg stage will be killed making larval embryo die inside the egg itself.
- Pheromone traps for attracting the moths and killing before egg laying, SPODOPTERA FRUGIPERDA [FAW- Fall Army Worm] pheromone traps may be installed at the fields. 4-5 traps per acre. traps and lures are available on Bighaat.com
- Bird perchs can be installed in the fields to make birds sit and eat off the larvae on the leaves.
- Light traps with poison bait can also be installed in the fields during nights to kill the gravid moths.
- Chemical control may be made by spraying some of the insecticides provided below
Following chemicals may be used to kill the pest. Spraying in the evening will be effective since they come out to feed in the night times.
and if required
The army worm will be dwelling in the soil and will be coming out to feed the baiting technique may be an effective method to kill them. As the bait has attractant jaggery the larvae gets attracted to jaggery, feed on the bait mixture and will be killed avoiding them to feed on the corn plants. Bait mixture made in to small balls must be broadcasted evenly all over the maize plot preferably atb the base of plants .
The process of baiting can be a mixture of 3 components,
- Poison (Insecticide) 1 liter : 2. Carrier or base (Rice bran) 10 kg , and Attractant (Jaggery) 1 kg. Mix all the items with given ratio to prepare the bait mixture.
K SANJEEVA REDDY,
Senior Agronomist, BigHaat.
Disclaimer: The performance of the product (s) is subject to usage as per manufacturer guidelines. Read enclosed leaflet of the product(s) carefully before use. The use of this product(s)/ information is at the discretion of user.
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