A note on the die-back of Blue pine (Pinus wallichiana) due to beetle attack
A note on the die-back of Blue pine (Pinus wallichiana) due to beetle attack
Hanif Gul and Mirza Hakim Khan
ABSTRACT
The beetle population developed on the weak trees under moisture stress growing on warmer aspects and ridges with stony soil The stressed trees had very little sap which made them prone to the attack of above beetles The grubs of these beetles constructed concealed and irregular gallaries in the twigs and branches, causing damage to conducting tissue by complete strangulation. Since the insect damage was mainly due to stress caused by drought and was also below the economic limit, therefore no conventional control measure were feasible, rather than to wait for improvement in the moisture conditions in coming monsoons and winters. Moisture availability in this way will reduce the stress and reset the health and vigor of the trees, thereby naturally eliminating the insect pests.
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