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Eurasian Hemp BorerGrapholita delineana
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Adults were found in fields from 5 of the 6 eastern Colorado counties visited in 2018
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Volunteer hemp examined June 18 were infested with larvae in late stages of development
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The last stage larva changes from cream colored to pinkish, as do some other Grapholita species
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Exterior symptom of stalk tunneling – leaf flagging
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Serious damage to buds was observed in one field located in northeastern Colorado
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Pheromone lure to monitor Eurasian hemp borer?
Traps containing available lures used to monitor three other Grapholita species oriental fruitworm, cherry fruitworm, lesser appleworm) failed to capture Eurasian hemp moth
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Adults were found everywhere – in areas with no previous history of hemp….
There must be significant non-Cannabis host plants that can sustain this insect
Some knotweed (Polygonum)? Hops?
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Proposed project for 2019 –Attempt suppression of Eurasian hemp borer with releases of Macocentrus ancilyvorus (‘Mac”)