Wheat, Triticum aestivum (L.), is the major crop with the largest
area under cultivation in Pakistan and it plays a significant role
in the economic stability of the country. Wheat possesses a high
food value and provides all the necessary constituents of human
life in an adequate and well-balanced form as compared to other
cereals. Wheat being the major food grains, there has been
considerable increase in its consumption due to population
pressure, income improvement and substitution effects. Out of the
total food grain consumption, the share of the wheat is more than
70 percent. It is cultivated over 8069 thousand hectares with
annual production of 19235 thousand tons. The average yield in the
year 2003 was 2384 kg/ha. The aphid problem can be tackled with the
application of commonly used insecticides but the drawback lies
with their haphazard use resulting in problems of health hazards,
environmental pollution and development of resistance in insects
against insecticides. It is, therefore, advisable to screen out
wheat varieties/cultivars possessing resistance against aphids.
General
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