Impact of dry weather on infestation rate of aphids (Homoptera

Aphididae: Adelgidae) on highland conifers in Azad Jammu and Kashmir

Muhammad Rahim Khan, Idris Abd. Ghani, Muhammad Rafique Khan, Alia Hayat, Abdul Ghaffar Khan

Research output: Contribution to journalArticle

Abstract

An unusual high infestation of Aphids and Adelgids has been a big challenge for the last 5-10 years in Himalayan highland conifers. The highest attack rate has been observed during the early winter from mid of November and continues until the end of January. The principle aim of the study conducted was to identify the aphid pest species and to find out the factors that contribute in the severe infestation of aphids/adelgids during dry winter and the species variation from six natural forests sites. The interaction between aphids and their host trees were thoroughly studied and there was no apparent indication of genetic variation among the conifer trees. Uniform attack rate was seen on the trees those were under severe water stress. The pine trees from same study site were not attacked at all or less attacked was due to the severity of physiological drought. Soil moisture around the affected and nonaffected trees was estimated and there was a significant difference between the availability of gravimetric soil moisture between the attacked (0-25%) and non-attacked trees (50-75%). The most of the startling affect of the damage occurred on terminal portions of upper stems of those trees severely affected by the water stress and true firs that brought by the family Adelegidae. None of the natural enemy of pest was found on a single study site during the peak infestation period of early winter.

Original languageEnglish
Pages (from-to)79-85
Number of pages7
JournalPakistan Journal of Zoology
Volume44
Issue number1
Publication statusPublished - 2012

Fingerprint

Adelgidae
Aphididae
Homoptera
conifers
highlands
weather
India
winter
water stress
soil water
pests
Abies
natural enemies
Aphidoidea
Pinus
drought
genetic variation
stems

Keywords

  • Adelgids
  • Aphids
  • Conifers
  • Field capacity
  • Generation
  • Holocyclic and anholocyclic
  • Permanent wilting point
  • Physiological drought
  • Residual water
  • Sap flow

ASJC Scopus subject areas

  • Animal Science and Zoology

Cite this

Impact of dry weather on infestation rate of aphids (Homoptera : Aphididae: Adelgidae) on highland conifers in Azad Jammu and Kashmir. / Khan, Muhammad Rahim; Abd. Ghani, Idris; Khan, Muhammad Rafique; Hayat, Alia; Khan, Abdul Ghaffar.

In: Pakistan Journal of Zoology, Vol. 44, No. 1, 2012, p. 79-85.

Research output: Contribution to journalArticle

Khan, Muhammad Rahim ; Abd. Ghani, Idris ; Khan, Muhammad Rafique ; Hayat, Alia ; Khan, Abdul Ghaffar. / Impact of dry weather on infestation rate of aphids (Homoptera : Aphididae: Adelgidae) on highland conifers in Azad Jammu and Kashmir. In: Pakistan Journal of Zoology. 2012 ; Vol. 44, No. 1. pp. 79-85.
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