Abstract:
xperiments were carried out to study on some morphological and physiological
features of Stemphylium botryosum causing Stemphylium blight and its control with
fungicides and' antagonist both in vitro and in vivo at Plant Pathology Division,
Bangladesh Agricultural Research Institute, Joydebpur, Gazipur during the period of
September'07 to April'08. The experimental design was CRD in lab condition and
RCBD in field condition having five and four replications, respectively. The colony
color of S. botryosum was greenish brown, irregular margin and velvety texture on
PDA medium. The suitable temperature and pH for the maximum colony growth was
25°C and 6.0, respectively. The maximum (100%) germination of conidia was found
at 25°C after 6 h of incubation. In the in vitro test, six fungicides viz. Iprosun 50WP,
Edcuzeb 80WP, Proud 2SEC, Rovral SOWP, Emivit 50WP and Agrirnyl had the
potentiality to inhibit the radial mycelial growth even at a lower (500 ppm)
concentration except Agrimyl (Mancozeb + Metalaxyl) that inhibited radial colony
growth at higher (2000 ppm) concentration. In field condition the minimum disease
score (1.0) was recorded in Iprosan SO WP treated plot and the highest (4.75) was
found in control' plot. Among the six fungicides Iprosan SOWP from the iprodione
group gave the best performance and yielded the highest root length (9.48 ern), shoot
length (~.6 em), number of branches plant" (9.2S), number of pods plant" (39.10),
thousand grain weight (21.08 g) and grain yield (1271.00 kg ha").
Description:
A Thesis
Submitted to the Faculty of Agriculture,
Sher-e-Bangla Agricultural University, Dhaka
in Partial fulfillment of the requirements
for the degree of
MASTER OF SCIENCE (MS)
IN
PLANT PATHOLOGY
