Studies on seed insect pests of forest trees
Studies on seed insect pests of forest trees
Wali-ur-Rehman
ABSTRACT
Studies on seed insect pests, conducted in the
laboratory at the Pakistan Forest Institute, Peshawar
revealed that seeds of 30 out of 70 tree species were
infested with 24 insect species. Among them 86%
Coleopterous and 5.6% Lepidopterous adults represented
23 species of seed pests while 8.4% adults belonged to a
Hymenopterous parasite. 13 of the 24 insect species,
identified by the I.I.E. London, belonged to Coleoptera
(9 species), Lepidoptera (3 species) and Hymenoptera (1
species). Caryedon serratus among Coleoptera and Hypsipyla robusta and Didia sp. Among Lepidoptera were
found the most serious pests infesting seeds of Acacia
tortilis (80%), Cedrela toona (97.5%) and Bauhinia
variegate (73.5%) respectively. The unidentified pests
caused heavy infestation of seeds of Acaica catechu
(98.4%), Aleurites fordii (88.8%) and Pongamia glabra
(62.3%) whereas seeds of 40 tree species were found free
from insect damage. A Hymenopterous parasite,
Phanerotoma sp. Caused 16% parasitism in each of
Coleopterous and Lepidopterous pests.
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March 1993
Vol. 43, Iss. 1
