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The Pathogenicity, Virulence, and Biocontrol Potential of Two Bipolaris Species on Johnsongrass (Sorghum halepense)

Published online by Cambridge University Press:  12 June 2017

Richard S. Winder  and
C. Gerald Van Dyke
Richard S. Winder
Affiliation:
Dep. Bot., North Carolina State Univ., Raleigh, NC, U.S.A. 27695-7612
C. Gerald Van Dyke
Affiliation:
Dep. Bot., North Carolina State Univ., Raleigh, NC, U.S.A. 27695-7612
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Abstract

Bipolaris sorghicola (isolate BS1) and an unidentified Bipolaris species (isolate BX1) were isolated from johnsongrass in North Carolina. Inoculum of BX1 was mass produced in solid and liquid cultures, whereas inoculum of BS1 could only be produced in solid cultures. When six formulations of inoculum of BX1 were compared, vegetable oil was the best adjuvant. Isolate BX1 displayed some host specificity in pathogenicity tests. In the greenhouse, isolate BS1 was more virulent on johnsongrass than isolate BX1. In growth chambers, increasing conidium concentration and younger plant ages interacted to increase virulence of BX1, as did interactions between inoculation, johnsongrass density, and low soil fertility. In Raleigh, NC, isolate BX1 caused very little damage in the field, with or without pretreatment with metolachlor. In Greenville, MS, isolate BX1 caused significant (52%) mortality to annual johnsongrass with very little damage to corn or grain sorghum. The biocontrol potential of the two organisms is uncertain.

Keywords

Johnsongrass, Sorghum halepense (L.) Pers. ♯3 SORHABipolaris sorghicola (Lefebvre & Sherwin) AlcornBipolaris sorokiniana (Sacc. in Sorok.) Shoem.Bipolaris zeicola (Stout) Shoem.corn, Zea mays L. subsp. maysgrain sorghum, Sorghum vulgare Pers.metolachlor, 2-chloro-N-(2-ethyl-6-methylphenyl)-N-(2-methoxyl-methylethyl)acetamideBiocontrolbiological controlbioherbicidefermentationpathogenfungusBipolaris sorghicolaBipolaris sorokinianaBipolaris zeicolaZea maysSORHA
Type
Special Topics
Information
Weed Science , Volume 38 , Issue 1 , January 1990 , pp. 89 - 94
Copyright
Copyright © 1990 by the Weed Science Society of America 

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References

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