PNABD246.pdf

in performance to monocrotophos were evaluated on 2 and 12 days old mungbean
plants against preflowering insects. Each insecticide was applied to 4
replicated plots (50 sq.m) in a randomized complete block design. Spray volume
averaged 400 I/ha. All plots, including the check, received postflowering
insecticide (0.05 kg a.i. deltamethrin/ha). Plastic sheeting (1 m wide) was
held between plots to prevent spray drift. The trials were conducted during the
dty season in the village of Poo, Manooag municipality, Pangasinan province.
Mungbean (300,000 plants/ha) was broadcast sowed and harrowed into tilled soil
on fields previously planted to puddled rice during the monsoon season. Fields
were irrigated once to ensure even germination. Rainfall was 0 mm, RH averaged
79%, and the mean daily maximum and minimum temperatures were 31 C ad 19 C,
respectively, for the crop period. Beanflies were counted by dissecting 25
plants/plot. Flea beetle damage was estimated visually as % defoliation on a
per-plot basis. Aphids were scored (1-9 scale) on a per-plant basis expressed
as an average/plot: 1=no aphids, 3=winged aphids, 5=several colonies, 7=many
distinct colonies, 9=many coalesced and indistinct colonies. Yield was based on
15 sq.m. Of the nonpyrethroids - triazophos, omethoate, dimethoate, fenthion,
and carbophenothion were equal to monocrotophos for beanfly control at 0.25 kg
a.i./ha. All four synthetic pyrethroids tested were effective against beanfly,
particularly permethrin (0.02 kg a.i./ha) and deltamethrin (0.01 kg a.i./ha).
Deltamethrin at 0.005 kg a.i./ha was promising. All of the insecticides tested
performed well against flea beetle and aphids. Phosalone, phosmet, ethion, and
Metasystox were not particularly effective against beanfly, but they did
produce high yields, indicating that perhaps other insects were causing yield
losses. [AS/THHI
*0648 Venkataramaiah, C. ; Reddy, A.J. ; Chandrasekharam, V. 1980. On
DDT-induced 'radicular proliferation' in Phaseolus mungo Linn. CURRENT
SCIENCE, v.49(6):242-243. [En] (A:PS)
The blackgram seedlings treated with DDT showed retarded growth of the
seedlings. [THH]
*0649 Lin, C.S. 1981. Resistance of beans to insects. CHINESE JOURNAL OF
ENTOMOLOGY, v.1(2):1-6. [En] [En Ch Abst] (A:PS)
Mungbean varieties (V 2535 and V 2533) were moderately resistant to the
beanfly and leaf miners. The mechanism of resistance was antixenosis. Cowpea
was highly resistant to the feeding adult of the Chinese rose beetle. There is
a significant negative correlation between leaf toughness and the percent area
damage by the Chinese rose beetle. Among the test varieties, increase in the
toughness of the leaves decreased the percent area of damage by this beetle.
[AS]
*0650 Vyas, H.N. ; Saxena, H.P. 1981. Toxicological and persistence studies
of some insecticides in relation to pest complex and plant growth of green
gram, Vigna radiata (L.) Wilczek and field pea, Pisum sativum L. PULSE CROPS
NEWSLETTER, v.1(1):98. [En] (A:PS)
Various insecticidal treatments were evaluated against important pests of
mungbean and pea during 1976-78. The results showed that disulfoton 5 G, 1.5 kg
a.i./ha applied in soil and 4% seed treatment with carbofuran proved to be very
effective in controlling galerucid beetle (Madurasia obscurella Jacoby),
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