My Montepulciano vines are showing a good amount of shatter.
There are some concomitant findings: The Montepulciano is in the middle of a fulminant Powdery Mildew infection. There is also some leaf discoloration that appeared after my initial sulfur spraying.
Pertinent Past History:
I had been holding off on water to control vigor (I know, I know… it was a dry winter…). I also skipped the soil amendments last year. In part, this was because I had a brutal year at home and in part because I felt I may have overdone it the previous year. In 2010, I had a soil analysis done. Results are here (upper block is where the Montepulciano is planted).
Unfortunately, helping care for a senile (and declining) grandmother and taking care of a 10 month-old infant during the day (on top of that pesky day job) tends to put a monkey wrench in the vigneorn lifestyle. The first spraying was on May 16th – before bloom was over. My second spraying was on June 3rd.
By then, the PM exploded. Interestingly, while Montepulciano is supposed to be more resistant to PM, but it is much more heavily affected this year.
Which of the following is most likely the cause of the shatter (millerandage)?
- A) Water deficiency
- B) Powdery mildew
- C) Sulfur burn (spraying before fruit set)
- D) Other – please elaborate.