Onions-General Information-Successful Cultivators-Common Pests and Diseases

Aug 26, 2026

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This document provides comprehensive information on cultivating onions, covering general details, successful cultivation varieties, and common pests and diseases. It details the scientific classification of onions (Allium cepa), belonging to the Amaryllidaceae family. Optimal growing conditions include full sun and well-drained, fertile soil. Onions can be grown from seeds, sets, or transplants, with bulbing influenced by day length. The document categorizes onion varieties based on their requirements for day length: Short Day (10 hours), Intermediate Day (12-13 hours), and Long Day (14 hours), recommending Long Day varieties for Delaware. Specific successful cultivators mentioned are 'Big Daddy' (Spanish style, long day, good for storage), 'Walla Walla' (sweet, mild, long day), and 'Red Candy' (glossy red, sweet, intermediate day). A significant portion of the document is dedicated to identifying and listing common pests and diseases that affect onions, including Onion Maggot, Leafminers, Thrips, Downy Mildew, Leaf Blight, and Onion Rust. Additional information includes the sources of the photos and the entities providing the information: New Castle County Master Gardeners, Rick Judd, Gail Hermenaus, and the University of Delaware Cooperative Extension.

LanguageEnglish

CategoryGeneral

FormatPDF

Pages1

Reading Time2 min

AccessFree to download

General Information

Successful Cultivators

Common Pests and Diseases

FAQs

What are the ideal soil and sunlight conditions for growing onions?

Onions thrive in well-drained, fertile soil and require full sun for optimal growth.

How does day length affect onion bulbing and which varieties are best for Delaware?

Onion bulbing is triggered by day length. Long Day varieties, which form bulbs when day length reaches 14 hours, grow best in northern areas like Delaware.

What are some common pests and diseases that can affect onion crops?

Common issues include Onion Maggot, Leafminers, Thrips, Downy Mildew, Leaf Blight, and Onion Rust.

Can you provide examples of successful onion cultivators mentioned in the document?

The document highlights 'Big Daddy' (a long-day Spanish style yellow onion good for storage), 'Walla Walla' (a sweet, mild, long-day onion), and 'Red Candy' (a glossy red, sweet, intermediate-day onion).

Aug 26, 2026

Upload by Bintang