How to detect and control fall armyworm in maize farming

What is Fall Armyworm FAW?

Fall armyworm is an insect pest with moths as the adult stage and larvae (caterpillars) as the destructive stage.

Maize and sorghum are the most preferred hosts even though it attacks a wide range of hosts causing up to 100% loss if left uncontrolled.

How to identify fall armyworm caterpillars

The first instar larvae are very small and grey in colour while the second and third instars are greenish or yellowish-brown in colour and have hair like spikes.

The 4^th to 6^th instars are brownish and have a characteristic light-coloured “inverted y” mark on the head front, which links with the middle thin stripe.

There are four blocks dots in a square formation on the rear abdomen segment.

What are the damage symptoms of fall armyworm?

Young larvae (first to third instars stages ) feed on leaves, causing transparent windowpane like damage initially appearing as “scratch marks “ on the leaves.

Order larva; 4th and 6^th instars cause large ragged and elongated holes on leaves, leading to a shredded appearance.

At the reproductive stages of the host plant, order larvae clip the tassels making shot holes on ears and feeding the grains.

Larvae produce large amounts of frass (excreta) as they feed and grow.

Read Also

• How to get high yields in maize farming
• Maize farming-Know the right variety for your region

How to control and manage fall army warm

Early scouting and monitoring. This involves looking for any crop damage, larva or eggs weekly starting from crop emergence stage to flowering stage.

The use of pheromone traps helps in identifying the presence of the pest and possible egg-laying.

Spray 15ml of thunder in 20litres of water late in the evening or early in the morning when the larvae are not hiding at two weeks intervals.

Reference

Kenya Agricultural & Livestock Research Organisation

About Post Author

Kelvin Wairimu

Kelvin Wairimu is a Young Passionate Agripreneur, Manager and Chief Editor Of The Farmworx. He is an Experienced and Practicing Farmer, Agricultural Economist and a Consultant.He holds a Bacherors Degree in Agricultural Economics From University of Eldoret,CPA 3 And a Certificate in Advanced Computer Software.

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