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Role of plant parasitic nematode (s) and fungi in guava wilt

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Title Role of plant parasitic nematode (s) and fungi in guava wilt
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Creator RM Khan, S Kumar, PP Reddy
 
Subject Guava cv; Allahabad Safeda; guava wilt; Helipotylenchns dihyslera; Fusarium oxysporum; nematode-fungus synergism
 
Description Not Available
Random surveys undertaken in Assam, Nagaland, Jharkhand, Orissa and West Bengal largely revealed the prevalence of Helicotylenchur dihyslera, Hoplalaimus sp, Meloidogyne .rp., Pralylznchus sp, Rotylenchulus renifoflnis and a number of other Tylenchids and Dorylaimids in the rhizospheres of healthy and wilted guava plants. H. dihysrera in terms of population frequency and density was found to be the dominant species in wilted guava plants. Pot culture experiment established pathogenic potential of H. dihystera on guava cv. Allahabad Safeda. Higher initial inoculum density (2000 nematodes/pot) was found to bring about a significant reduction in plant height only after eight-months and sixteen months. Concomitant inoculation of H. dihysrera and Fusarium oxysporum revealed a synergistic interaction particularly at 500 and 2000 nematodes (along with fungus) initial inoculum densities. Final population of nematode was found to be 19l, 586 and 234 at 100, S00 and 2000 initial inoculum densities, respectively as compared to 304, 1085 and 465 when corresponding nemic population were inoculated along with fungus. Leaf fall was found to be highest (36 no.) in 2000 nematodes and fungus treatment as compared to 3 no. in single nematode inoculation. Weeds like Ageralum conyzoidex and Cammelina benghalensis were found to act as collateral hosts of H. dihystera. Population dynamic studies revealed that relatively higher population density of H. dihystera was noticed during June to September/October. Studies clearly indicated the role of nematodes as a co-factor in guava wilt.
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Date 2017-10-11T08:18:03Z
2017-10-11T08:18:03Z
2001-01-01
 
Type Research Paper
 
Identifier Not Available
http://krishi.icar.gov.in/jspui/handle/123456789/5422
 
Language English
 
Relation Not Available;
 
Publisher Association for Advancement of Pest Management in Horticultural Ecosystems