PNABD246.pdf

pests, 1981. INSECTICIDE AND ACARICIDE TESTS, v.7:94. [En] (REP.MB-2761)
Insecticides as seed treatments at 10 g a.i./100 kg seed were tested at
IRRI for control of preflowering mungbean insect pests. Mungbean seeds (100
kg/ha) were shaken in a plastic bag with each insecticide and 25% gum arabic
before sowing to 5 sq.m plots on Feb. 26 in a randomized complete block design
with 3 replications. Plant stand was thinned to 300,000 plants/ha after
emergence. The Santa Rita series soil (clayey amorphos isohyperthermic, Typic
Hapludolls) -- pH = 6.5, 52% pore space, 2.7% organic matter, 34% clay, 36%
silt, 30% sand -- a';eraged 39 and 28 C for daily maximum and minimum
temperatures at 5 zm depth, respe:tively, the first 14 days after sowing. There
was no rainfall during this dry season trial, but the plots were irrigated with
overhead sprinklers. In each plot at 21 days after crop emergence (DE), 25
random plants were dissected for evidence of beanfly stem tunneling and 25 leaf
bud terminals were removed randomly, placed in 70% ethyl alcohol for counting
thrips under a microscope. All plots including the untreated control received
postflowering insect pest protection with 0.03 kg a.i. decamethrin EC/ha 25,
35, 45 DE. Yield cuts were 5 m row per plot. Carbofuran 30ST, promecarb 38SP,
chlorthiophos 25SP, and chlorthiophos 25ST provided the best control of both
beanfly and thrips under heavy pest pressure. For an unexplained reason,
formetanate hydrochloride 50SP gave a superior yield without significant insect
control. Dioxacarb 50WP was phytotoxic to explain the low thrips count. [AS]
*0654 Singh, A.K. ; Gupta, D.S. ; Hameed, S.F. 1983. Translocation and
dissipation of disulfoton in mung bean, Vigna radiata var. aureus Hubn.
JOURNAL OF ENTOMOLOGICAL RESEARCH, v.7(2):127-132. [En] [En Abstj
(REP.MB-2601)
Translocation and dissipation of disulfoton residues following application
of four doses, viz., 1.0, 1.5, 2.0 and 2.5 kg a.i./ha at the time of sowing of
mungbean, Vigna radiata var. aureus Hubn., were evaluated by microbioassay and
colorimetric methods. Residues of disulfoton in the soil immediately following
its application were 9.75, 13.15, 16.84 and 19.05 ppm due to respective four
doses. Dissipation rates increased with the increase in dosage rates of
disulfoton. On the 20th day after application, the dissipation was 67.65,
71.05, 73.70 and 75.65% corresponding to these four doses. Its half-life in the
soil ranged from 12.54 to 13.11 days. The amount of disulfoton translocated
into mungbean plant reached its maximum on the 20th day, being 2.45, 4.44, 5.36
and 7.08 ppm for the four dosages, respectively. At harvest, 66 days after
application, the residue was below the detectable level both in the soil and
plant. [AS]
*0655 Singh, K.N. ; Srivastava, B.P. ; Nath, G. 1983. Phosphine residues
and its effect on the germination of stored pulses. INDIAN JOURNAL OF
ENTOMOLOGY, v.45(I):71-80. [En] [En Abstj (REP.MB-2537)
The residues of phosphine in mungbean resulting from treatment of 2, 4 and
8 tablets/ton were found to reach the tolerance level of 0.01 ppm in 0.07,
0.50, and 1.63 days, respectively. The corresponding time taken for residues to
reach the lowest level of detectability (0.001 ppm), was 1.68, 2.51 and 4.34
days. In cowpea phosphine residues were found to reach the tolerance level of
0.01 ppm in 0.10, 1.19 and 2.19 days and the corresponding time for the
residues to reach the lowest level of detectability was found to be 2.49, 3.85
and 5.38 days for 2, 4 and 8 tablets/ton, respectively. In the case of pea the
residues of phosphine resulting from treatment of 2, 4 and 8 tablets/ton were
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