الفهرس 
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Abstract
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SUM 1:.1A. R Y·
The present study was conducted at Bahteem Agriculture
Research Station in order to have better under-
,.•~”
standing on the effect of intensive agriculture on the
rate of infestation of different cotton insects.
Four treatments ( hill spacing , row spacing t
design during 1981, 1982 seasons. ” Giza-67” cotton
variety was planted in an area of two feddan. divided
into 4 equal parts. Each part representing an experimental
unit. The following results were obtained,
1 - Aphids and Thrips:
A- Hill spacingl- ~he tested treatment showed that
in 15 em. hill spae;ng was severely attacked while the
lowest damage was recorded in 35 cm. hill spacing .Analysis
of variance showed highly significant dlfferance
between the four treatment .”
B- Row spacingl- Thr: maximum rate of infestation by
Aphids and Thrips in 14 Tows/2Kassaba while 10 rows/2Ka.
were less attacked .”Analysis of variance gaTe highly
significant difference in the tested treatments •
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c- Planting on both sides of row
Planting on bQ,th sides of row showed higher
infestation than the control treatment but ”t”
tested was insignificant between the two treatments
•
2 - Cotton leafworm infestation z
A - Hill spacing :
Results showed that 15 em. treatment
attracted the highest number of egg-masses
while 35 em , hill spacing’ . gave the
lowest number of egg-masses • Analysis of
variance showed highly significant defferenee
between the tested treatments •
B - Row spacing :
Results obtained showed that 14 row/ 2
kassaba harboured the highest number of
egg-masses while 10 rows/ 2 kassaba harboured
the lowest egg-masses Analysis of variance
showed highly sign~icant difference
between tested treatments •
c - Planting on both side$of row:
Planting en both sideS of row harboured’
high numbers of egg-masses that the control
treatment tit” test showed that no significant
differe~ce betwee~ exists the two
treatments •
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J - Pink and spiny bollworm infestation z
The population cf pink bollworm was higher
than the spiny bollwolm • The degree of spiny
bollworm infestation of tested treatment was
very low • It was no·i;icec. that it attacked the
green bolla during the end of the season •
Analysis of variance of the data obtained during
1981 and 1982 seaSOl~ showed that no signifioant
differences between the number of pink. bollworm
in the different tes’~ed treatments • It was
noticed that the highest number of pink bollworm
wes observed in 35 hill spacing and 10 row spaoing.
Yield loss :
’j
The yield loss percentages generally increased
by the inorease of the distance separating
the ootton hills or rows. The planting on both
sides of row treatment gave the least yield loss.