Pest Management Guidelines - Vegetables
Pest Management Guidelines
A Cornell Cooperative Extension Publication

  
Cornell Guide for Pest Management of Vegetables

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Chapter 12 Asparagus

Chapter 20    Onions

Contents

20.1 Recommended Varieties. 201

20.2 Planting Methods. 201

20.3 Fertility. 202

20.4 Harvesting. 202

20.5 Disease Management 202

20.5.1 Bacterial soft rot, Erwinia carotovora, sub. sp. carotovora;  Slippery skin, Pseudomonas gladioli pv. allicola;  Bacterial canker and Sour skin, Burkholderia cepacia. 202

20.5.2 Fusarium basal rot, Fusarium oxysporum f. sp. cepae. 203

20.5.3 Botrytis leaf blight (BLB), Botrytis squamosa. 203

20.5.4 Botrytis neck rot, Botrytis allii 207

20.5.5 Damping-off, Pythium spp. 208

20.5.6 Downy mildew, Peronospora destructor 208

20.5.7 Flower blight, Botrytis squamosa, B. cinerea, and B. allii 210

20.5.8 Nematodes, primarily northern root-knot (Meloidogyne hapla) and the lesion (Pratylenchus spp.) 211

20.5.9 Pink root, Phoma terrestris. 211

20.5.10 Purple blotch, Alternaria porri 212

20.5.11 Smut, Urocystis colchici 213

20.5.12 Stemphylium leaf blight, Stemphylium vesicarium, and Stalk rot, S. botryosum.. 213

20.5.13 Onion yellow dwarf virus transmitted by aphids. 215

20.6 Insect Management 216

20.6.1 Onion thrips, Thrips tabaci 216

20.6.2 Onion maggot, Delia antiqua. 217

20.6.3 Seedcorn maggot, Delia platura. 219

20.6.4 Bulb mite, Rhizoglyphus robini 219

20.6.5 Cutworms, Primarily the black cutworm, Agrotis ipsilon. 220

20.7 Weed Management 221

20.8 References. 223

 

20.1 Recommended Varieties

 

 

Table 20.1.1 Recommended onion varieties

Transplants

Seeded, main season

 

Mars (red) (F1)1

Listed in approximate order of

 

Renegade (F1)

maturity

 

Redwing (F1)

 

Early Yellow Globe strains

 

Corona (F1)

 

Benny’s Red (red)

 

Viceroy (F1)