Screening of pigeonpea genotypes against podfly, melanagromyza obtusa (Malloch) and assessment of damage by blister beetle, mylabris pustulata thunberg
Abstract
Screening of pigeonpea genotypes against pod fly
revealed that out of 20 genotypes, none was found completely resistant,
however marked differences were noticed among different pigeonpea
genotypes. The pod and grain damage of different pigeonpea genotypes
ranged from 2.77 to 15.16% and 2.4% to 8.55%, respectively. Three
genotypes HDM 04-1, H 2000-47 and AL-1493 were promising as they
recorded lowest pod (2.77-5.93%) and grain (2.4-8.55%) damage and
were considered suitable for incorporation into breeding programe for
pod fly resistance. The data on days to 50% flowering revealed that
there is no correlation between days to 50% flowering and pod fly
incidence.
The results achieved on morphological and biochemical
parameters of genotypes revealed that trichome density and length of
pods were negatively correlated with podfly incidence. The biochemica
constituents of seeds of pigeonpea genotypes revealed that total sugars,
total phenols, tannins and potassium content showed negative
correlation with pod fly incidence. Protein and phosphorus content
showed positive correlation with pod fly incidence and are responsible
for susceptibility to podfly.
Studies on population of blister beetle on different pigenpea
genotypes revealed that it was found to be highest at the time of
maximum flowering and decreases with flower shedding and pod
formation. Seasonal mean beetle population was found to be maximum
in H 2004-24 (5.9 beetles/plot) and lowest in AL-1489 (2.7
beetles/plot). Results achieved on flower damaged by the blister beetle
under laboratory condition revealed the damage ranging from 16.6 to
27.5 per cent on 20 test genotypes. However, there was no significant
yield differences in the caged and uncaged cultivars.
Description
Keywords
Irrigation, Irrigation scheduling, Yields, curd, crops, vegetative propagation, Soil water content, Cauliflowers, Biological development, Nutrients