ven118lec6_(gubler_pm_bot.)_08

ven118lec6_(gubler_pm_bot.)_08 - VEN 118: Fungal pathogens...

Info iconThis preview shows pages 1–21. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: VEN 118: Fungal pathogens Dr. Doug Gubler Powdery Mildew Botrytis bunch rot Grapevine Powdery Mildew Erysiphe ( Uncinula) necator Powdery Mildew Slows maturity Reduces brix Causes fruit cracking thus increase in rots Stem mildew results in poor storage of table grape 3% disease on wine grapes results in off flavors Severe shoot disease results in death Severe shoot disease results in bud perennation Powdery Mildew Index Based on Canopy Temperature Start - Post bud break 3 contiguous days with 6 continuous hours 70 to 85 F Add 20 per day 6 continuous hours of 70 to 85 F Subtract 10 per day Less than 6 hours 95 F or greater Index never less than zero or more than 100 What does Mildew Index mean??? Index = 0 to 30 Spray interval lengthened Index = 40 to 50 Spray interval normal Index = 60+ Spray interval shortened Example: Day 1 7 hours between 70 & 85 20 2 6 hours 40 3 6 hours 60*** --------------------------------------------- 4 5 hours 50 5 5 hours 40 6 5 hours 30 7 4 hours 20 8 3 hours 10 9 5 hours 0 10 7 hours 20 11 6 hours 40 12 8 hours 60*** 13 6 hours 80 14 5 hours 70 15 7 hours 90 16 8 hours 100 17 5 hours 90 18 4 hours 80 19 5 hours 70 20 6 hours 90 21 7 hours 100 22 9 hours, max temp 98 F 90 23 8 hours 100 24 7 hours...
View Full Document

This note was uploaded on 09/29/2010 for the course VEN 81437 taught by Professor Larrywilliams during the Fall '10 term at UC Davis.

Page1 / 57

ven118lec6_(gubler_pm_bot.)_08 - VEN 118: Fungal pathogens...

This preview shows document pages 1 - 21. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online