PNABD246.pdf

mechanism of resistance was antixenosis. Resistant varieties had relatively
higher degrees of pubescence. Higher amounts of antifeedant, and lower amounLs
of attractant compared to the susceptible varieties. These factors prevented or
deterred the feeding and/or oviposition of the beanfly and the leaf miner
adults. The antifeedant chemical showed positive phenolic color reaction and an
infrared absorption band at 2240/cm, suggesting a cyanide ion functional group.
[AS]
*0695 Manohar, S. ; Balasubramanian, M. 1980. Note on the oviposition
behaviour of agromyzid stem fly, Ophiomyia phaseoli Tryon (Diptera:
Agromyzidae), in blackgram. MADRAS AGRICULTURAL JOURNAL, v.67(7):470-471.
[En] (A:PS)
The oviposition behaviour of beanfly, Ophiomyia phaseoli, in blackgram was
studied. The malp and female flies were kept in gauze cages containing
blackgram planL. in small pots. The adults started mating soon after emergence.
The female fly wandered over the surface of leaves to locate a suitable spot,
and then inserted her ovipositor vertically into the leaf and laid the eggs.
After each insertion, the female fly moved backwards and sucked the sap oozing
from the site of ovipositor insertion. The eggs were laid singly. More eggs
were laid on the lower surface than on the upper surface. The mean number of
eggs laid on the lower surface of leaves was 1.8 as compared to 0.4 on the
upper surface. [THH]
*0696 Manohar, S. ; Balasubramanian, M. 1980. Study on the seasonal
incidence of agromyzid stem fly Ophiomyia phaseoli Tryon (Diptera: Agromyzidea)
in blackgran. MADRAS AGRICULTURAL JOURNAL, v.67(8):534-537. [En] [En Abst]
(A:PS)
A trial was conducted with 12 monthly sowings from December 1976 to
November 1977 with blackgram (Co 2) at Coimbatore to study the seasonal
incidence of stem fly Ophiomyia phaseoli Tryon. The study revealed that the
stem fly incidence was minimum in September, October and November sown crops
and was maximum in March, July and August sown crops. The stem fly incidence on
the 45th day after sowing was positively correlated with total rainfall during
the corresponding period and was not correlated with other weather factors. [AS]
*0697 Goh, H.G. 1983. Studies on mungbean beanfly. Shanhua, Tainan :
AVRDC. 59 leaves LEn] (AVRDC Research Interns' Report) (REP.MB-2307)
Five AVRDC mungbean accessions: V 2396, V 3495, V 4281, V 3428 and V 2184
were planted to assess the mechanism of resistance in mungbean to beanfly. The
mechanism of resistance was found to be antibiosis. The resistance to beanfly
was due to the thickness of the trifoliate leaf, trichomes on unifoliate leaf
and stem, dry weight of unifoliate leaf, white and green color of upper leaf
surface, TC value of upper and lower leaf surface, lower moisture content of
unifoliate leaf, diameter of stem, height of plant, length of petiole and
length of root. These factors prevented or deterred the feeding and oviposition
by the beanfly. In the survey of insects associated with mungbean grown during
summer, the population ratio of Ophiomyia phaseoli was the highest, followed by
Melanagromyza soja. Beanfly parasite population was low during late July to
August. [TIUH]
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