PNABD246.pdf

*0746 Prasad, D. ; Premchand 1980. Growth and development of Diacrisia
obliqua Walker on various food plants. INDIAN JOURNAL
4
OF ENTOMOLOGY,
v. 2(4):b11-blb. [EnJ [En Abst] (REP.MB-2870)
The effect of nine food plants, viz., cowpea (Vigna unguiculata),
(Arachis
groundnut
hypogaea), sunflower (IHelianthus annuus),
cotton
blackgram
(Gossypium
(Vigna mungo),
spp.), alfalfa (Medicago saLiva), sorghum (Sorghum vulgare),
velvet bean (iucuna cochi nclniensis) and lantana (Lauitana camara),
growth and
on
development
the
of Diacrisia obliqua Walker was studied.
larvae
None of
survived
the
on sorghum, velvet bean anid lntalna. Oil tie basis
period,
of larval
larval survival, larval weight, pupal period, pupal weight
sex-ratio
and
of D. obliqua, sunflower was tle most favourable food and
the
cowpea
feast. On
was
the basis of the growth index, six of the remaining food plants
could be arranged in order of decreasing suitability. Sunflower,
blackgran,
cotton,
alfalfa, cowpea and groundut. Tlus the food plants
favourable
which were
tor larval survival were also suitable for rapid development
ihsect. in
of
general,
the
food plants which were the best for the development of the
insect produced more females and vice versa. [AS/TOO1i]
*0747 Prasad, D. ; Premnchand 1980. Some observations on moulting behaviour
and larval mortality of Diacrisia obliqua Walker on different foods. INDIAN
JOURNAL OF ENTOMOLOGY, v.42(4):82b-828. [Enj (REP.MB-28b9)
Laboratory studies on the molting behaviour and larval mortality of
Diacrisia obliqua on cowpea, peanut, sunflower, blackgram, cotton and alfalfa
were conducted in India. The insect passed through 6 larval instars on all food
plants except sunflower, on which larvae had only 5 instars and pupated
earlier. On cotton and alfalfa the 4th and 5th instar were extended by one day.
The most of larval mortality was observed in the first week. On cowpea the
mortality extended up to 12 days. The highest mortality, 50.771., was recorded
on cotton. [AS]
*0748 Premchand 1981. Presence of feeding deterrent in velvet bean, Mucua
cochinensis Roxb. INDIAN JOURNAL OF ENTOMOLOGY, v.43:217-219. [En]
(REP.MB-2314)
A study was conducted to assess if the leaves of velvet bean (Mucunz
cochinchinesis), on which the larvae of Diacrisia obliqua are unable to
survive, contained any chemical acting as a feeding deterrent. It was found
that coating leaves of soybean, blackgram and rice bean with extracts from
velvet bean leaves reduced the percentage of leaf area consumed by D. obliqua.
Chemical analysis of mature velvet bean leaves showed the presence of L-Dopa,
lower concentrations of compounds which might be tetrahydroisoquinolines, and
large amounts of phenolic material. These compounds probably acted as a feeding
deterrent. [THIIJ
*0749 Vyas, H.N. ; Saxena, H.P. 1982. Comparative efficacy of some
insecticides against galerucid beetle, Madurasia obscurella Jacoby, infesting
greengram. INDIAN JOURNAL OF AGRICULTURAL SCIENCES, v.52(1O):689-693. [En]
[En Abst] (A:PS)
Seed treatment of mungbean [Vigna radiata (Linn.) Wilczek] with carbofuran
4% proved consistently effective against Madurasia obscurella Jacoby, followed
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