Cylindrocladium crotalariae, which causes Cylindrocladium black rot (CBR) of peanut (Arachis hypogaea), can be isolated at a low frequency from nondamaged peanut seed (seed size 6.4 ≥ 25.4 mm slotted screen) not treated with a seed protectant fungicide. Peanut seed obtained from peanut fields in Suffolk, VA, and Martin County, NC, where CBR was severe in 1985 were infected at a frequency of 1.5% and 1.4%, respectively. Cylindrocladium crotalariae was isolated at twice the frequency from pieces of seed than from whole seed. However, C. crotalariae was not isolated from seed treated for 2 weeks with a seed protectant (DCNA + captan). The fungus was not isolated from seed devoid of testae or seed embryos, but was isolated from seed testae at a frequency of 0.4%. Discolored seed (≥6.4 × 25.4 mm) were infected at a frequency of 7.9%, but following seed treatment, the isolation frequency dropped to zero. Discolored seed measuring <6.4 × 25.4 mm were infected with C. crotalariae at a frequency often exceeding 10%.
Full Article Available as PDF only - Use Download Feature
Keywords: peanut, seed contaminant, Arachis hypogaea, seed protectant
How to Cite:
Porter, D. & Mozingo, R.,
(1986) “Importance of Seed Transmission in The Spread of Cylindrocladium crotalariae¹”,
Peanut Science 13(2),
30 Jun 1986
1Cooperative investigation by Agricultural Research Service, U.S. Department of Agriculture, Suffolk, VA 23437, and Virginia Polytechnic Institute and State University, Blacksburg, VA 240461.
Mention of a trademark of proprietary product does not constitute a guarantee or warranty of the product by ARA or VPI & SU and does not imply its approval to the exclusion of other products that may also be available.