الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
Leguminous crops are important in the diet of a large
percentage of the population of the world. They are grown
for home use, for market, for canning, for freezing, or
for seed purposes. The most important food legumes are
Faba bean, Vicia faba L.; Beans, Phaseolus vulgaris (L.);
Pea, Pisum sativum L.; Cowpea, Vigna sinensis (~avi.);
Lentil, Lens esculenta (Moench); Fenugreek, Trigonella
foenum-graecum L.; Lupin, Lupinus termis (Forsk.); and
Lucerne, Medicago sativa L., •• etc.
Legumes are liable to attack by several insect pests
from the early stage of growth through the late developmental
phase to the post harvest stage. The most important
of the field insects in several countries as well as in
Egypt are the different species of aphids, which cause
severe crop losses principally by direct feeding damage
and transmission of virus diseases
The pea leaf roll virus (PeLRV) and cowpea aphid-borne
mosaic virus (CAMV) are among the most important viruses
known to infect v. faba and V. sinensis, respectively.
They infect many other species of legumes, and are
recorded in many parts of the world.
Because of the importance of the two viruses in the
cultivation of food legumes in ~gypt and a lack of
information concerning various aspects in transmission of the two viruses by insects, an inve~tigation was undertaken
to study the virus-vector relationship and susceptibility
of certain faba bean varieties to aphid infestation.
The economic threshold and the economic injury levels for
Aphis craccivora on faba bean crop were studied. These
are first reco1·ds in ~gyptian environment.