Studies on the ecofriendly management of Powdery mildew (erysiphe cruciferarum opiz ex. Junell) of mustard (brassica juncea (linn.) Czern & Coss)
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Date
2004
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Publisher
CCSHAU
Abstract
Powdery mildew caused by Erysiphe cruciferarum Opiz ex. Junell is one of the
important disease of mustard (B. juncea (L.) Czern & Coss) growing all over the India. Disease
progression was maximum during mid of March (15-3-04) on all the four varieties in all the
three staggering dates of sowing when T. Max. 32.5ºC, T. Min. 12.7ºC, RHM 94.5 per cent, RHE
38.5 per cent, Avp. M 12.30mm, Avp. E 14.30 mm, Wind Speed 2km/hr and Sunshine 8.80 hrs.
Disease intensity and AUDPC increased from 48-74 per cent and 326-440 respectively with
delay in date of sowing. The apparent infection rate also observed higher during mid of March
on all the varieties during first two dates of sowing. In third date of sowing apparent infection
rate was maximum after mid of March i.e. 3 days later.
Amongst nine varieties evaluated for slow mildewing components, the speck
size, no. of specks/leaf, no. of conidia/speck, disease progression and disease intensity were
less in the slow mildewing variety GSL-1 as compared to fast mildewing cultivars/varieties such
as RH-30, RH-9801, RH-9304 RH-8812, RH-9901, RC-781 and Purple Mutant. The disease did not
appear in the variety HC-9603.
Maximum yield loss was recorded in the variety RH-9304 (29.47%) followed by
RH-9801(26.04%), RH-8113 (23.03%) and RH-30 (19.0%) whereas average yield loss was 24.55
per cent.
Among the fifty four varieties/lines tested for resistance against powdery mildew
under field conditions, eleven varieties/lines viz. YSPb-24, TH-68, GSL-1, Midas, MNS-9605, HC-
1, HC-2, HC-9605, HC-9603, B. alba and Sinapis alba were observed as resistant, five
varieties/line viz. Domo-4, BSH-1, TMH-50, TMH-52 and T-27 as moderately resistant to
powdery mildew. Similarly, six varieties/lines such as Vaibhav, Varuna, Kranti, RLM-1359, RL-
198 and B. chinensis were susceptible and all other varieties/lines were moderately susceptible
to powdery mildew.
Powdery mildew can be effectively controlled by foliar application of Karathane
(0.1%), Sulfex (0.2%), Salicylic acid (0.05%) and Nimbicidin (0.15%). Sulfex (0.2%) was most
economical in managing the powdery mildew and gave maximum B:C ratio 6.34:1, 8.24:1 in
both the varieties RH-9801, RH-9304 respectively. It was followed by Salicyclic acid 2.53:1,
3.24:1 in both the varieties RH-9801 and RH-9304 respectively.