STUDIES OF MAJOR INSECT PESTS OF SOYBEAN {Glycine max (L) Merril) AND THEIR CONTROL IN SAMARU ZARIA
STUDIES OF MAJOR INSECT PESTS OF SOYBEAN {Glycine max (L) Merril) AND THEIR CONTROL IN SAMARU ZARIA
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Date
1997-11
Authors
ADAMU, RABIU SALISU
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Abstract
Field experiments were conducted for a two-year period
(1994 and 1995), during the wet season at Samaru (between
11°11'N and 07°38'E) to study the effect of post flowering
insecticidal treatments and frequencies of application on
insect pest infestation, damage and yield of soybean. The
effect of planting dates and spacings on insect infestation
and damage to soybean were also studied. The major insect
pests identified during the vegetative phase were Ootheca
mutabilis salhb and Pygomorpha vignaudi Geur. At the
reproductive stage were the pod sucking bugs; Nezara viridula
L., Agonoscelis versicolor (Fab.), Halydicoris ventralis
(Dall) and Sphaerocoris annulus (Fab.). The population of the
pod sucking bugs was below the economic threshold level.
Insecticides and frequencies of application had no significant
effect on mean insect population, although treated plots had
lower insect population than the control.
The percentage defoliation and pod damage were below the
threshold level. There was non significant difference between
insecticides and frequencies of application on percentage
defoliation and pod damage.
Soybean yield parameters such as number of pods per
plant, 100 seed weight and seed yield per hectare were not
significantly affected by insecticidal treatments and
frequencies of application.
Planting dates and spacings had no significant effect on
the mean number of 0. mutabilis and P. vignaudi per plant and
number of pod sucking bugs per plot. Percentage pod damage
and seed damage index showed non-significant response to
planting dates and spacings. Planting dates had significant
effect on some soybean yield parameters such as shelling
percentage and seed yield. The significant difference in
these parameters are not attributable to insect infestation
and damage as there was no significant difference between the
planting dates in respect of insect infestation and damage.
Climatic factors particularly rainfall pattern and
distribution influenced soybean yield more than insect
infestation and damage.
Description
A Thesis submitted to the
Department of Crop Protection
Ahmadu Bello University
Zaria, Nigeria
In partial fulfillment of the requirements
for the degree of
MASTER OF SCIENCE
NOVEMBER, 1997
Keywords
STUDIES,, MAJOR,, INSECT,, PESTS,, SOYBEAN,, {Glycine max (L) Merril), CONTROL,, SAMARU, ZARIA.