Fwd: P&PDL log #00-1189 (Walters)
Hey group,
Below is a report from purdue university thats shows some
intial test results from my 801.5 Stelts plant. Looks like it was attacked
by pytothora or pythium. Hopefully now that it is drying out my other two
plants will survive.
Brad Walters
Greenwood, Indiana
- To: b*@aol.com
- Subject: P&PDL log #00-1189 (Walters)
- From: s*@btny.purdue.edu
- Date: 30 Jun 00 14:39 -0500
PLANT & PEST DIAGNOSTIC LABORATORY
765-494-7071 FAX: 765-494-3958
http://www.ppdl.purdue.edu/)
This message contains information on a sample submitted to the P&PDL.
PRELIMINARY Diagnosis and Control Recommendations
SUBMITTER:
BRAD WALTERS
186 RUNYON DEER RD
GREENWOOD IN 46142
CLIENT: Homeowner
BRAD WALTERS
186 RUNYON DEER RD
GREENWOOD IN 46142
SAMPLE NUMBER: 00-1189
Date preliminary completed: 6/30/00
Date reply printed: 6/30/00
HOST: Pumpkin
CULTIVAR: Atlantic Giant
SAMPLE CONDITION: Good
INFO DESIRED: Problem ID; Control measures
NOTES:
Brad, The stem sample you sent to us had a watersoaked elongate lesion at the base, and reddish-orange discoloration of the interior of the entire stem piece. The base of the stem appeared to be softened and rotting. I showed your sample to Dr. Ray Martyn, our department head. He has been a cucurbit pathologist for 20 years, and spent many of those years in Texas. He indicated that the orange stem tissue was not a symptom he had seen before. He has examined plants with the newly described disease called yellow vine that occurs in Texas, and he said your sample did not resemble any plants infected with that disease that he has seen. He suggested that the symptoms may be due to Fusarium or Phytophthora.
I examined the stem under the microscope, and did not observe any bacteria in the xylem vessels. Because you were anxious for a quick response, I ran a serological test (a quick test that uses antibodies to detect specific pathogens) for Phytophthora on the watersoaked tissue, and obtained a strong positive reaction, indicating the possibility of Phytophthora being present in that tissue. Unfortunately, the tests will (very infrequently) develop false positive reactions, and thus I am isolating from this tissue on selective agar media to detect the presence of Phytophthora and Pythium ( a closely related water mold fungus that causes root and crown rot under wet conditions). I have also used media that favor the growth of Fusarium, Rhizoctonia and other plant pathogenic fungi to determine their presence in your sample. The results of these isolation tests will be available later next week. In the meantime, it may be a good idea to take precautions against Phytophthora with!
your other plants (that is, a Subdue or Ridomil treatment). We will contact you with the final results of our isolation tests when they are completed. Karen Rane, Plant Disease Diagnostician
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A hard copy of your response and any enclosures are being sent to you
via campus mail or US mail.
Identification No. 1
COMMON NAME: Phytophthora blight
AGENT/FAMILY: Fungal
AGENT/SPECIES: Phytophthora sp.
CERTAINTY OF ID: Most likely
Identification No. 2
COMMON NAME: Fusarium crown rot
AGENT/FAMILY: Fungal
AGENT/SPECIES: Fusarium sp.
CERTAINTY OF ID: Possibly
