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Märgborre (Biology, life cycle (Svärmar sent mars- tidig maj (1) (När…
Märgborre
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Control options, counter measures
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Höga temperatursummor kan göra att 2 svärmningar hinns med. Detta är ock ovanligt. Men risk finns i södra delarna av norden
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In genereal opinionThe young beetle are responsible for the most of the attacks. Thats why its important to prevent the emergence of the new generation.
One way to prevent the emergence of the youngling is to take away the tree within a few weeks after the flight period
Techincally tihs could be aschived by quick hauling, barking or spraying with insecticides
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During the flight period it is important to haul out cut down trees so that the beeetles can regenate in these trees. Wood felled after the period can be stored out in the forest the remaning of the year. Detta gäller röjningar och gallringar med.
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Host range
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Skadar vanligtvis tall vanlig tall, men attacker på andra pinus och barrträd
Prefer freshly cut stumps and slash to mate in, but can attack stressed trees (2)
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Diagnosis
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anfallna träd
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Årsskott
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40% of the attacks occured in current years shoot, 50% in one-year. and the rest in the older shoots
The entrance hole ranged from 2-6 mm. And most are located within the first cenimeters from the bud or node
The attacks are distributed all over the crown. But a tendency towards the higher parts of the crown
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Distribution
mindre märgborre vanligare i syd norge, centrala delarna av sverige, syd finland
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Impact on host
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40% of the attacks occured in current years shoot, 50% in one-year. and the rest in the older shoots
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