A note on walnut borer, Zeuzera coffeae (Cossidae; lepidoptera) on walnut trees (Juglans regia) in district Dir
A note on walnut borer, Zeuzera coffeae (Cossidae; lepidoptera) on walnut trees (Juglans regia) in district Dir
Hanif Gul and Wali-ur-Rehman
ABSTRACT
Survey was conducted in different valleys of Dir District to record the extent of damage caused by the walnut borer to walnut trees. The pest caused heavy damage in Sultan Khel valley where tree infestation was 90-100% in Sairai and 80-90% in Kotkai villages. Number of dry branches per tree ranged from 5-15 at Sairai and 5-10 at Kotkai. Similarly 60-70% trees at Sromanzo and 30-50% at Navra of Dir and Barawal were infested by the pest with 10-12 dry branches per tree in the former and 5-8 in the Latter village. In Ushery valley 20 to 50% infestation of walnut trees was found in Jabar and 10 to 20% each in Almas and Usherai villages. Number of infested branches per tree in these villages ranged from 2-10. In Kadikhel, Karo, Tormong and Nihag valleys tree infestation occurred upto 30% while infested dry branches per tree ranged from 0-10. No pest was found in Khairabad valley.
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March 1999
Vol. 49, Iss. 1
