Life cycle and pathogenicity of Aphelenchoides swarupi Seth & Sharma on Agaricus bisporus (Lange) Singer
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Date
2015
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CCSHAU
Abstract
Investigations were carried out on life cycle and pathogenicity of Aphelenchoides swarupi on U3 strain
of Agaricus bisporus and relative susceptibility of its different strains to this nematode. The nematode
took 5-6 days for completion of life cycle from J
2
to adult at 30 ºC which was prolonged to 13-14 days
at 15 ºC. A total of 10 strains of A. bisporus viz., ABL2, ABL3, ABL4, ABL5, ABL6, B10, B13,
DMR3, DMR7 and U3, and two strains (A1 and A6) of Pleurotus eous were evaluated against A.
swarupi. Nematode multiplied on all the strains of A. bisporus and caused mycelial damage to them. Of
these, ABL2 and DMR7 were found to be resistant and tolerant, respectively while remaining were
susceptible. On these strains, nematode population and reproduction factor were higher after 30 days
than after 15 days of nematode inoculation. Both the strains of P.eous were found immune to this
nematode. In pathogenicity experiment, 10 nematodes per plate as well as per kg compost in bags were
found pathogenic. In plates, reproduction factor and population growth rate were minimum at one and
these decreased further when inoculum level increased from 10 to 40. In bags, spawn run was poor at
1000 nematodes per kg compost but moderate at 10 and 100 nematodes per kg compost in comparison
to good in control. Yield and final nematode population were affected by inoculum levels and time of
inoculation. Yield reduction was more in all inoculum levels when inoculation was done at spawning
as compared to casing. Final nematode population was higher when inoculation was done at time of
spawning as compared to time of casing. Reproduction factor decreased with increase in inoculum
level and higher population growth rate was achieved when nematode inoculation was done at casing
as compared to when it was done at spawning.
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Keywords
Nitrogen, Planting, Grain, Yields, Wheats, Inorganic acid salts, Drying, Dry matter, Developmental stages, Fertilizers