Re: [apple-crop] spectrum instruments

2011-04-26 Thread Los, Lorraine
Hello All, I have a few Spectrum machines and have seen the discrepancies between the different models. As someone else mentioned, one of the reasons is probably related to the issue on how to decide if 2 or more wetting events should be considered one continuous wetting event. The NEWA

[apple-crop] RE : spectrum instruments

2011-04-26 Thread Vincent Philion
Hello ms Los. In a nutshell: pathologists seldom agree on anything. ;-) More seriously, 24 hrs was suggested by MacHardy based on different sources and is a OK value. However, there is field data on potted plants that show SOME ascospore survival for many days. That's one of the many

Re: [apple-crop] spectrum instruments

2011-04-26 Thread Juliet Evelyn Carroll
The 24 hour time frame used in NEWA was decided on by Bill Turechek when he was the extension tree fruit pathologist at Cornell and is primarily based on the work by Becker and Burr on interrupted wetting events. Prior to that NEWA had used 8 hours. The tricky part comes in combining a

[apple-crop] RE : spectrum instruments

2011-04-26 Thread Vincent Philion
Hi! Thanks Julie: I had forgotten about this other limitation of the old style calculations: Where to stop? With the RIMpro approach (boxcar cohort programming) this is never an issue because the proportion of spores that survives multiple drying, etc becomes nil and drops out of the