1/29/14. Managing Cool Season Greens and Cole Crops. What s in a name? Cruciferous crops, but not cole crops. Other cool weather crops

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1 1/29/14 What s in a name? Managing Cool Season Greens and Cole Crops Crucifer-plants in the plant family Cruciferea. Also cruciferous. Brassica-Brassicaceae=cruciferea. Brassica sp. Cole crops-cultivated crops in the species Brassica oleracea. Includes-cabbage, cauliflower, collards, kale and kohlrabi. Daniel S. Egel, SW Purdue Ag Center egel@purdue.edu, (812) Cruciferous crops, but not cole crops Other cool weather crops Turnip= Brassica rapa. Radish= Raphanus sativus. In family Brassicaceae Mustard= in genera Brassica and Sinapus. Garden cress= Lepidium sativum. Brassicaceae Lettuce-sunflower family Spinach-goosefoot family Cool season vegetable diseases White rust White mold Downy mildew Rhizoctonia blight Black spot Aster yellows Fusarium wilt Unknown 1

2 Affects all crucifer crops Bacteria introduced crop residue, weeds, seed Favored by warm, humid weather Use tested seed/treat seed/inspect transplants Crop rotation 2-3 years Avoid over head irrigation Chemicals of limited importance Actigard Copper products White rust White rust Common on crucifer crops, spinach Primarily cosmetic Caused by water mold. Races exist. Survives in crop debris Crop rotation, fall tillage, resistant cultivars, specialized fungicides Spinach-plant resistant cultivars White rust-garden cress 2

3 Sclerotinia rot Sclerotinia rot White mold AKA, sclerotinia stem rot, watery soft rot Greater problem on lettuce (lettuce drop) Crop rotation, deep plowing, apply fungicides after thinning, cover crops Sclerotinia rot Downy mildew-lettuce Downy mildew-lettuce Bruce Watt 3

4 Downy mildew-lettuce Downy mildew-cabbage Y. Shen Downy mildew Watermold Humid, cool weather-3-4 hrs of moisture Use resistant cultivars Specialized Fungicides Rhizoctonia blight Rhizoctonia blight Rhizoctonia blight/bottom rot E. Maynard 4

5 1/29/14 Rhizoctonia blight/bottom rot-lettuce Damping-off, leaf discoloration, plant collapse Fungus- long term soil survival Warm, moist conditions Contact with soil Management-rotation, fall tillage, well drained soils, plastic mulch?, fungicides Black spot E. Bush Black spot Important on crucifer crops May survive on seed, crop residue 6-8 hours leaf moisture required Management-use tested seed, crop rotation & fall tillage, fungicides, partially resistant cultivars Black spot Aster yellows W.M. Brown, Jr. Aster yellows 5

6 Aster yellows Caused by phytoplasma Spread by leaf hopper Wide host range Stunting, yellowing, twisted stems/leaves, pink sap Avoid problem areas Get official diagnosis Fusarium wilt W.M. Brown, Jr. Fusarium wilt/yellows Yellowing, one-sided wilt, vascular discoloration Long lived resting spores Races Resistant varieties May not work at high temperatures Boron deficiency? 6

7 1/29/14 LUNA PRODUCTS-BAYER CROPSCIENCE LUNA PRODUCTS-BAYER CROPSCIENCE Luna experience-12 hr REI/7 day PHI Watermelon only fluopyram 17.6% (7), tebuconazole 17.6% (3) Alternaria leaf blight, anthracnose, gummy stem blight, powdery mildew Luna Sensation-12 hr REI/0 day PHI Watermelon only fluopyram 21.4% (7), trifloxystrobin 21.4% (11) Alternaria leaf blight, anthracnose, powdery mildew LUNA PRODUCTS-BAYER CROPSCIENCE Luna Privilege-12 hr REI--0 day PHI WM & 7 days potato Watermelon and potato fluopyram 41.5% (7) Watermelon-Alternaria leaf blight, gummy stem blight, powdery mildew Potato-early blight, white mold, Botrytis leaf spot, silver scurf Luna Products labled on watermelon-page 105 ID-56 Product Active ingredients Alt. blight Anth. Gummy s.b. Luna Experience Luna Privilege Luna Sensation fluopyram/ tebuconazole G G G G fluopyram G G G fluopyram/ trifloxystrobin G G G Pow. Mil. PROLINE-BAYER CROPSCIENCE PROLINE-BAYER CROPSCIENCE 12 hour REI/7 day PHI Cucurbit vegetables Fusarium wilt Gummy stem blight Southern blight Powdery mildew Proline 480 SC may be applied by either ground or chemigation..do not use in water used for hand transplanting. 7

Managing Cool Season Greens and Cole Crops. Daniel S. Egel, SW Purdue Ag Center (812)

Managing Cool Season Greens and Cole Crops. Daniel S. Egel, SW Purdue Ag Center (812) Managing Cool Season Greens and Cole Crops Daniel S. Egel, SW Purdue Ag Center egel@purdue.edu, (812) 886-0198 What s in a name? Crucifer-plants in the plant family Cruciferea. Also cruciferous. Brassica-Brassicaceae=cruciferea.

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