ECOLOGY OF EURYSTYLUS OLDI (POPPIUS) (HEMIPTERA: MIRIDAE ): A PEST OF SORGHUM
ECOLOGY OF EURYSTYLUS OLDI (POPPIUS) (HEMIPTERA: MIRIDAE ): A PEST OF SORGHUM
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Date
1996
Authors
JACQUES, BEYO
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Abstract
Eurystylus oldi (Poppius) which was considered to be a
minor pest of sorghum, is now a real constraint to sorghum
production in West and Central Africa. Field and laboratory
experiments were conducted at Samaru (Zaria) on the insect's
biology, population dynamics, host range and dry season
survival, as well as to screen several sorghum cultivars for
sources of resistance. Sorghum cultivars NR 71213 and ICSH
89009 NG were tolerant of E. oldi, with reference to grain
yield, 1000-grain weight and floaters. Pre-oviposition period
for female insects was 6+0.63 days. Eggs hatched after
4.25±0.5 days (for males) and 4.83±0.75 days (for females).
There were five nymphal instars on sorghum. Mean longevity
from egg to adult was 50±5.03 days for males and 50+3.33 days
for females. Adult insects mated around 6 a.m. In 1994 and
1995, the population of E. oldi nymphs and adults peaked in
the last week of September. Pigeon pea was found to be an
alternative host of the insect.
Description
A thesis submitted to the Postgraduate School, Ahmadu Bello
University, Zaria, in partial fulfilment of the requirements
for the Degree of Master of Science in Crop Protection.
Department of Crop Protection
Faculty of Agriculture
Ahmadu Bello University
Zaria, Nigeria
1996
Keywords
ECOLOGY,, EURYSTYLUS,, OLDI POPPIUS, HEMIPTERA,, MIRIDAE,, SORGHUM