CONSEQUENCES OF PLANTING TIME AND FUNGICIDE APPLICATION IN CONTROLING
LATE BLIGHT DISEASE OF POTATO VAR. DIAMANT
M.S. Hossain,
M. Afroz, M.S. Islam, M.E.Haque* and T.K.Dey
*Corresponding author; E-mail: eakramul_haque@ymail.com
Astract
An
experiment was conducted at the Breeder Seed Production Centre, Bangladesh
Agricultiural Research Institute, Debigonj, Panchagoarh to find out the
appropriate treatment combination against late blight of potato during 2007-08
seasons under natural field condition. The split plot experiment included two
planting dates, 15th November (D1)
and 30th
November (D2) and seven
different spray treatments viz. no spray (T1), one time spray of
Dithane M-45 (T2), two times spray of Dithane M-45 (T3),
one time spray of Secure (T4), two times spray of
Secure (T5), 1st spray Dithane M-45+2nd
spray Secure (T6), and 1st
spray Secure+2nd spray Dithane M-45 (T7) using the
popular variety Diamant. All the parameters tested were significantly
influenced by the effect of planting time and spray treatments. Potato planted at 15th November
showed less infection of P.
infestans and higher yield. Significantly higher
tuber yield (32.15 t ha-1) was found
from potato planted at 15th November
which was higher by 34.29% than that of 30th November
(23.94 t ha-1). All the spray
treatments showed better yield over control treatment (T1). The highest yield of potato was obtained
from the interaction treatment planting time D1 with 2 times spray Secure (36.38
t ha-1) which was statistically at per with 2 times spray Dithane
M-45 (36.03 t ha-1) . Singly the highest net return of Tk.318250 ha-1with
benefit cost ratio 3.11 was observed from two times spray Dithane M-45 while
the lowest by no spray of Tk.167850 ha-1with benefit cost ratio
2.15.
Key words: Planting time, fungicide, late blight and potato.
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Return Volume: Journal of Experimental Biosciences 5(2): July 2014
