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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 />

121

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