Abstract:
A set of experiment were conducted at the laboratory of the Department of plant
Pathology, SAU and Spices Research Centre (SRC), BARI, Shibgoanj, Bogra,
Bangladesh, during the month of September-October in 2010. Field experiment was
conducted at spices Research Centre, BARl~ Shibgonj, Bogra to determine' the
integrated approach for the management of purple blotch of onion for seed
production during October, 2010 to March 2011. The treatment of the expeirment
were Rovral wp @ 0.2% (TI), Rovral wp @ 0.1% + Provax 0.25% (T2);
Trichoderma 5xl06 spore/ml @ 100 ml/plant (T3); Rovral wp @ 0.1% + Bavistin
0.5% (T4); Neem leaf extract 1:6 (w/v) (Ts); Rovaralwp @ 0.1% +Evaral @ 0.1%
(T6); Rovaral wp @ 0.1% +Ridomil gold MZ-72 @ 0.1% (T7); Rovaral wp @ 0.1%
+Secure @ 0.05% (Ts) andcontrolf'Ts). Different treatment has effect: on inhibition
of mycelial growth of the fungus. The lowest mycelial growth was recorded in case
of T7 followed by T2 where the highest mycelial growth was recorded in cas~ of
control (T9). In field experiment, the lowest disease incidence (both on leaf infection
and stalk infection) were recorded incase of treatment T7 ii•.comparison to other
treatments irrespective of days after transplanted while highest disease incidence was
recorded in control treatment (T9). The disease severity were also recorded the'
lowest in case of treatment T7 followed by treatment T2. The highest PDI was
recorded in control treatment. The disease incidence and severity were increased
gradually with the age of the plant but the increasing rate was the lowest in treatment
T7 and highest in control (T9)' The highest plant height (81.40cm) and the yield (1.24
ton/ha) were recorded in treatment T7 where as the lowest plant height (6I.20cm)
and seed yield (0.82. tonlha) were recorded in control (T9)'
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
