A Plague of Locusts

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Literally - as reported by CNN bq. CANBERRA, Australia (AP) -- A plague of locusts has engulfed towns in Australia's Outback, devastating crops just as farmers had begun recovering from a two-year drought. bq. The bugs started breeding in northeastern Australia after it was swamped by heavy rainfall late last month, and quickly migrated south to feed on newly planted crops of oats and alfalfa, agriculture officials said Tuesday. bq. "A thick haze of them came through over the weekend and chomped their way through our oats crop overnight," said Bev Dennis from her farm in Tomingley, 340 miles west of Sydney. bq. The oats were intended for lambs, which have struggled for two years with little green grass to eat as vast tracts of Australia experienced their lowest levels of rainfall in a century. bq. "We were just staggering out of the drought -- we are incredibly frustrated," Dennis said. "I just kept on thinking it's got to get better, but now we've got this." Ouch - first a couple years of drought and now, when they finally get some rain, it triggers this outbreak. I wonder if the lambs can eat them -- they are high in protien...

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Chickens eat them. It's one of their favorite foods. Smart grazers keep chickens around, and even move them through pastures in chicken wire enclosures open to the ground called "chicken tractors", because they eat so many bugs of all sorts. But chickens don't help much when a migrating swarm hits.

To control swarms a parasite, Nosema locustae, has been used. It must be spread every year to prevent swarms. Once a swarm has formed it's too late. It is spread in a mix with sweetened bran that some grasshoppers will eat and since they eat their own dead it spreads again and again.
Another parasite, Ageneotettix deorum, reduces egg laying but doesn't seem as effective as Nosema. The brightest hope seems to be Metarhizium anisopliae, a fungus developed in Nigeria. It is also expensive to use and takes 4-10 days to work, too long to save a crop but your neighbors may be grateful.

Many birds, amphibians and mammals eat grasshoppers and their egg pods. All of these biocontrol methods are useless against swarms that arive from distant places. When they come only strong pesticides will help and they are expensive to apply to large areas and contaminate everything.

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This page contains a single entry by DaveH published on March 17, 2004 1:22 PM.

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