Introduction

Horticultural crops grown in greenhouses are typically well irrigated and fertilized. These ideal growing conditions result in plants that are an attractive food source for many insect and mite pests (Figure 1.6). Consequently, greenhouse-grown

horticultural plants can provide an abundance of food for insect and mite pests, often forcing greenhouse producers to implement strategies that reduce plant damage and maintain crop marketability. The types of horticultural crops grown in greenhouses include annuals, perennials, tropicals (foliage),

woody plant material, orchids, and herbs and vegetables (Figure 1.7). In addition, many different crops, varieties, and cultivars are grown together. Greenhouse-grown horticultural crops are typically sold to florists, independent garden centers, or chain stores. The different crops, varieties, and cultivars can

vary in their susceptibility to certain insect and mite pests, thus impacting the input of pesticides and potential for plant injury (such as phytotoxicity). Nonetheless, multiple crops growing at different stages of development make pest management a challenge.