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Pathology<br />
KHAN, W.M.A., and R.K. SINGH. 1974.<br />
Anthracnose of arhar incited by Colletotrichum<br />
truncatum- Indian Phytopath.<br />
27:622-624. 950<br />
Stem anthracnose of pigeonpea (Cajanus<br />
cajan (L.) Millsp.) caused by Colletotrichum<br />
truncation (Sen.) Andrush and Moore,<br />
was observed in the last week of September<br />
1972. Survey of varieties indicated that<br />
only some of the early maturing varieties<br />
were free from the disease during this<br />
period. 'Infection was confined to main<br />
axis and lateral branches. Defoliation and<br />
drying-up of the complete plant were the<br />
ultimate signs of the infection.<br />
KHANNA, R.N., and R.S. SINGH. 1975.<br />
Microbial populations of pigeonpea rhizosphere<br />
in amended soils. Indian J. Mycol.<br />
PI. Pathol. 5(2):131-138. 951<br />
Count of fungi and actinomycetes had<br />
inverse relationship with plant age in<br />
nonamended s o i l , while optimum bacterial<br />
activity occurred at maximum vegetative<br />
growth of plant. Oil cake was stimulatory<br />
to microflora and sawdust was inhibitory.<br />
The inhibitory effect was overcome by<br />
supplemental nitrogen. Rhizosphere of<br />
pigeonpea significantly changed the effect<br />
of amendments on microflora. It reduced<br />
stimulatory effects of amendments on<br />
bacteria and actinomycetes but accentuated<br />
inhibitory effect of sawdust on these<br />
groups.<br />
KOSHY, P.K. 1968.<br />
Studies on the cyst-forming nematode of<br />
pigeonpea. Ph.D. (1968) Thesis. Indian<br />
Agricultural Research Institute, New<br />
Delhi, India. 952<br />
KOSHY, P.K., and GOPAL SWARUP. 1967.<br />
Factors affecting emergence of larvae from<br />
cyst of Heterodera oajani Koshy. Indian<br />
J. Nematol. 1:209-219. 953<br />
Emergence took place between 15 and 37°C,<br />
with 29°C optimum. More emergence was<br />
obtained from cysts conditioned to 40°C<br />
than those at 12°C. Aeration did not<br />
affect emergence of larvae. But constant<br />
exposure to light gave a significantly<br />
higher hatch than subjecting to total<br />
darkness. Optimum pH was 10.5. Root<br />
leachates from Cajanus aajan stimulated<br />
emergence of larvae from cysts. The cysts<br />
stored in air-dried soil under laboratory<br />
conditions remained viable for at least<br />
2 years.<br />
KOSHY, P.K., and GOPAL SWARUP. 1971.<br />
Investigations on the l i f e history of the<br />
pigeonpea cyst nematode Heterodera cajani.<br />
Indian J. Nematol. 1:44-51. 954<br />
Temperature was an important factor governing<br />
the time required to complete the l i f e<br />
cycle. At a soil temperature of 84°F the<br />
nematode completed one generation in 16<br />
days, whereas under cool conditions (10-<br />
25°C/50-75°F) the time required was 45 to<br />
80 days. The nematode was able to reproduce<br />
parthenogenetically, though it is a<br />
bisexual species. For rapid multiplication,<br />
however males were considered necessary.<br />
KOSHY, P.K., and GOPAL SWARUP. 1971.<br />
On the number of generations of Heterodera<br />
oajani, the pigeonpea cyst nematode, in a<br />
year. Indian J. Nematol. 1:88-90. 955<br />
H. cajani could complete nine generations<br />
in a year under laboratory conditions.<br />
Duration of l i f e cycle was prolonged during<br />
winter months. The favorable multiplication<br />
of the nematode was from June to<br />
September and April to June.<br />
KOSHY, P.K., and GOPAL SWARUP. 1972.<br />
Susceptibility of plants to pigeonpea cyst<br />
nematode, Heterodera cajani. Indian J.<br />
Nematol. 2:1-6. 956<br />
One hundred and five plant species, representing<br />
58 genera in 21 families, were<br />
tested for their suitability as hosts of<br />
Heterodera oajani', 19 of them (family : Leguminosae)<br />
were recorded as hosts.<br />
KULDIP SINGH, B.S. DAHIYA, and J.S. CHOHAN.<br />
1975.<br />
Evaluation of arhar (Cajanus cajan) germplasm<br />
lines against the s t e r i l i t y disease<br />
in the Punjab. PAU Res. J. 12(3):<br />
327-328. 957<br />
Two hundred and thirty-four lines were<br />
screened for reaction to the s t e r i l i t y<br />
virus in 1973 and 1974. L-3 and P-4785<br />
were resistant and 16 others were tolerant.<br />
KULKARNI, Y.S., M.K. PATEL, and<br />
S.G. ABHYANKAR. 1953.<br />
A new bacterial leaf spot and stem canker<br />
of pigeonpea. Indian Phytopath. 5(1):<br />
21-22. 958<br />
Gives an extended account of the disease<br />
and i t s causal agent and l i s t s factors<br />
conducive to disease development. Since<br />
the pathogen infects pigeonpea alone,<br />
showing host range specificity, it is<br />
proposed as a new species to be called<br />
Xanthomonas c a j a n i .<br />
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