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Anthracnose
Anthracnose management • Crop rotation ~3 years • Fall tillage • Field/greenhouse sanitation • Timely fungicide applications
anthracnose
� Host resistance • Pollenizers
� Fungicides • Products • Timings
� Diploid varieties needed to pollinate seedless
� Non-harvested diploids often used � Pollenizers vary greatly in fruit size, leaf
shape etc. � Are there differences in anthracnose
resistance?
� 15 diploid varieties grown in randomized/replicated design
� Inoculated with anthracnose fungus � Plants rated for disease � 2012 and 2013
Month 2012 2013
May 1.33 9.57
June 0.47 8.35
July 1.59 3.53
August 2.76 0.65
Rainfall comparison in inches-Vincennes, IN
Both May and June were the 4th wettest since 1984.
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+ is susceptible ++++ is resistant
� Fungicide trials
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Fungicide recommendations in the MW Veg Prod Guide.
� Re-visit pollenizer trial
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Watermelon EFI Value Changes over 2 week period
� Most intervals should be 7-14 days. � The frequency of rain is more important
than the amount. � A rain in the evening may be more impt
than one at midday. � It is best to spray before rain if possible. � Poor crop rotation affects spray intervals.
Trade Name Amount/A
MOA ALB ANT DM
Gavel 75DF 1.5-2 lbs M, 22 X X Presidio 75DF 3-4 fl oz 43 X Revus 2.08SC 8 fl oz 40 X Tanos 50WG 8 oz 27, 11 X X X Ranman 3.6 SC
2.75 fl oz 21 X
Forum 4.16SC 6 oz 40 X Zampro 14 fl oz 40,45 X
Products Labeled for Phytophthora blight of cucurbits --by effectiveness on Phytophthora blight.
Anthracnose Phytophthora Blight Bravo Gavel Cabrio Presidio 4SC Dithane Ranman Inspire Super Revus Luna Experience Zampro Luna Sensation Pristine Quadris Tanos Tanos Topsin M
Comparison of products labeled for control of anthracnose and Phytophthora blight of cucurbits.
Daniel S. Egel Purdue University [email protected]
� High tunnel=greenhouse without heat � Plants may be grown in ground or in pots � Both structures protect plants from rain � Both structures increase humidity � Tomatoes are by far the most common
crop in either structure.
Tomato-year 4 Crop rotation
Tomato-year 3 Tomato-year 2
Tomato-year 1
Watermelon-year 3
Tomato-year 1
Onions-year 2
Crop rotation
Corn-year 4
Tomato-year 4 Crop rotation
Tomato-year 3 Tomato-year 2
Tomato-year 1
� White woven ground cover • Clean and sanitize at the end of each year • Re-use several years • 8 strips 100 x 3 ft=$333
� Black landscape fabric • Under ground cover • One year only • 8 strips 100 x 3 ft=$87
� Reduce crop residue • Crop rotation • Remove crop • Floor covering
� Increase aeration • Correct spacing • Prune lower branches • Ventilation
� Botrytis gray mold � White mold (timber rot) � Leaf mold � Tomato spotted wilt
Botrytis gray mold
Botrytis gray mold
Botrytis gray mold • Primarily a greenhouse disease • Keep temperature up & humidity down • Lime soil for pH • Keep fertility levels up (N) • Calcium levels 2X P levels • Read label carefully for greenhouse use
white mold/timber rot
white mold/timber rot
White mold • Long crop rotations with cereals • Contans • Read label carefully for greenhouse use
S. Koike
Which greenhouse will be easier to clean?
leaf mold
leaf mold
White mold • Fall tillage • Crop rotation-3 years • Host resistance/races • Ventilate greenhouse to reduce humidity
• Fungicides-be safe & effective � Note REI and PHI information � Lack of weather & close contact to plants a concern � Look on label for greenhouse application info � 1) labeled for greenhouse use � 2) label prohibits greenhouse use � 3) label silent on greenhouse use.
