총 779페이지
770페이지 본문시작
3. 원 문
Onthewind:weedwebmoth
Large numbers of small brown moths have appeared suddenly overnight in several
regions;whatarethey,andhowmuchofariskwilltheybe?
Very high numbers of adult weed web moths have been reported in Bordertown and
Naracoorte.SARDIEntomologistshavealsoobservedthematWaiteandMaslinBeach.
PestFctssouth-easternrecentlyreportedhighnumbersofweedwebmothcaterpillarsin
broadleaf plants including canola, lucerne and broadleaf weeds. Current reports from
South Australia only indicate large swarms of moths. We do not know where these
havecomefrombutweedwebmothscandeveloponnativevegetationlikesaltbush.
While detecting moths provides a useful warning, there is a poor relationship between
mothscaughtandnumberofcaterpillars,soitshouldalwaysbeconsideredapromptto
monitor.
The biology of the weed web moth is poorly understood, but it is thought to be a
long-distance migrator, suddenly appearing in large numbers as seen here. This
abundance is thought to occur with seasons with early autumn rainfall and warm
weather. The moths already seemtohavedisappearedinsome areas, soitis unlikely
thattheywillbeariskforthecropstobesownsoon.Broadleafweedsandvolunteers
mayhostthesecaterpillars,soifyou’reworriedaboutpossibleweedwebmoth,youcan
monitorforthem.
Identifyingweedwebmoth:
Weedwebmothcaterpillarsareupto15mmlong.Theygenerallyfoundbetweenleaves
oftheplanttheyarefeedingon,heldtogetherwithsomewebbing,skeletonisingfoliage.
Theyareslender,hairy,andcanvaryincolourbetweengrey-green,dark-greenorpale
brown.Theyhaveablackheadandolderlarvaehaveadarkstripedownthemiddleof
theirbackwiththreerowsofsmalldarkspotsoneachside.
When disturbed, weed web moth caterpillars wriggle violently. They can also be very
active and crawl rapidly. Weed web moth caterpillars are known to feed on canola,
soybeans,lupins,lucerne,andawidevarietyofbroad-leafedplants.
Asadults,weedwebmothhavea20mmwingspanandarebuffcolouredwithdarker
brownorreddishflecks,mainlyontheforewings.
For more information on weed web moth management see cesar Australia’s recent
article.
- 770 -
Onthewind:weedwebmoth
Large numbers of small brown moths have appeared suddenly overnight in several
regions;whatarethey,andhowmuchofariskwilltheybe?
Very high numbers of adult weed web moths have been reported in Bordertown and
Naracoorte.SARDIEntomologistshavealsoobservedthematWaiteandMaslinBeach.
PestFctssouth-easternrecentlyreportedhighnumbersofweedwebmothcaterpillarsin
broadleaf plants including canola, lucerne and broadleaf weeds. Current reports from
South Australia only indicate large swarms of moths. We do not know where these
havecomefrombutweedwebmothscandeveloponnativevegetationlikesaltbush.
While detecting moths provides a useful warning, there is a poor relationship between
mothscaughtandnumberofcaterpillars,soitshouldalwaysbeconsideredapromptto
monitor.
The biology of the weed web moth is poorly understood, but it is thought to be a
long-distance migrator, suddenly appearing in large numbers as seen here. This
abundance is thought to occur with seasons with early autumn rainfall and warm
weather. The moths already seemtohavedisappearedinsome areas, soitis unlikely
thattheywillbeariskforthecropstobesownsoon.Broadleafweedsandvolunteers
mayhostthesecaterpillars,soifyou’reworriedaboutpossibleweedwebmoth,youcan
monitorforthem.
Identifyingweedwebmoth:
Weedwebmothcaterpillarsareupto15mmlong.Theygenerallyfoundbetweenleaves
oftheplanttheyarefeedingon,heldtogetherwithsomewebbing,skeletonisingfoliage.
Theyareslender,hairy,andcanvaryincolourbetweengrey-green,dark-greenorpale
brown.Theyhaveablackheadandolderlarvaehaveadarkstripedownthemiddleof
theirbackwiththreerowsofsmalldarkspotsoneachside.
When disturbed, weed web moth caterpillars wriggle violently. They can also be very
active and crawl rapidly. Weed web moth caterpillars are known to feed on canola,
soybeans,lupins,lucerne,andawidevarietyofbroad-leafedplants.
Asadults,weedwebmothhavea20mmwingspanandarebuffcolouredwithdarker
brownorreddishflecks,mainlyontheforewings.
For more information on weed web moth management see cesar Australia’s recent
article.
- 770 -
770페이지 본문끝
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