Crop destroying armyworm marches across mainland Africa

Posted Feb 6, 2017 by Karen Graham
Scientists are calling for urgent action to stop the fall armyworm, a crop-destroying pest that is spreading rapidly across mainland Africa, threatening food security and agricultural trade.
Spodoptera frugiperda (fall armyworm)
Spodoptera frugiperda (fall armyworm)
Canadian Biodiversity Information Facility
Scientists at the Britain-based Centre for Agriculture and Biosciences International (CABI) released research on Monday that shows the pest which had not become established outside the Americas, is now expected to spread rapidly "to the limits of suitable African habitat" within the next few years.
Since arriving in Africa last year, probably on imported produce, the agricultural pest has already ravaged corn fields in Ghana, and then, after traveling through Zambia and Zimbabwe, marched into South Africa on February 3. The armyworm is rapidly eating its way through what was considered to be a good crop year.
According to the Food and Agriculture Organization of the United Nations (FAO), the pest has also turned up in Malawi, Mozambique, and Namibia. The caterpillar destroys young corn, or maize plants by attacking their growing points and burrowing into the cobs, according to Reuters.
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CABI scientists are fearful the pest will spread to Asia and the Mediterranean within the next few years unless swift action is taken to halt the invasive pest's spread, reports the BBC, and the UN's FAO is already planning emergency talks on the issue.
The fall armyworm
The fall armyworm, Spodoptera frugiperda, belongs to the order Lepidoptera and is the larval stage (caterpillar) of the fall armyworm moth. The caterpillar or larval stage is a voracious eater and destroyer of crops.
It gets its name from its feeding habits, eating everything in sight before moving to the next crop or grassy field, like an army on the march. The armyworm's diet consists mainly of grasses and small grain crops, and when the caterpillars reach maturity, they can lay waste to a field in a matter of a few days.
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Second species of fall armyworm shows up in Ghana
CABI scientists have also found evidence of a second species of fall armyworm in Ghana. Research is ongoing to find out how it got there, how it spreads and how farmers can control it in an environmentally-friendly way.
"This is the first time it has been shown that both species or strains are established on mainland Africa," CABI's chief scientist, Dr. Matthew Cock said. "Following earlier reports from Nigeria, Togo, and Benin, this shows they are clearly spreading very rapidly."
Additionally, there is confusion in identifying the fall armyworm because there are several other species of armyworms already present in Africa. CABI experts are saying it could take several years to develop an effective method of controlling the caterpillars.