Ohio's Favorable Insects: Useful Arthropods

Ohio's Favorable Insects: Useful Arthropods

Managing Hop Pests with Natural Predators

Hop growers can maintain a balanced ecosystem in their fields by introducing and nurturing natural predators that help control common hop pests. These beneficial insects, such as predatory mites, lady beetles (ladybugs), and parasitic wasps, target pests like spider mites, aphids, and leafhoppers.

For instance, predatory mites (Phytoseiulus persimilis) are effective against spider mites, a frequent hop pest. Adult lady beetles consume aphids and other soft-bodied insects, while parasitic wasps (Trichogramma spp.) target pest eggs, helping reduce future pest populations.

To effectively monitor and enhance these natural predators in hop yards, Integrated Pest Management (IPM) practices are recommended.

Monitoring Regularly scout hops for pest and predator presence using methods such as sticky traps, leaf inspections, and sweep nets. Monitoring helps assess pest pressure and predator populations to time releases of beneficials appropriately.

Habitat Enhancement Increase habitat diversity and provide flowering plants that offer nectar and pollen to sustain predator populations when pests are scarce. Avoid broad-spectrum insecticides that harm beneficial insects.

Augmentative Releases Purchase and release natural predators at key times when pest populations are starting to increase. Releases should be done according to supplier guidance, often in early morning or late afternoon to avoid heat stress on beneficials.

Cultural Practices Maintain good sanitation by removing infested plant material and managing weeds that might harbour pests or disrupt predator activity.

By combining these steps, hop growers can maintain a balanced ecosystem where natural predators suppress pest outbreaks, reducing the need for chemical controls and improving sustainability.

Common predators in hop yards include predatory mites, lady beetles, lacewings, wolf spiders, and jumping spiders. Lacewings, for example, are efficient and voracious predators that feed on mites, aphids, and other soft-bodied insects.

Lady beetles undergo several stages in their life cycle. Adults are round and vary in size and colour, with adults of the minute pirate bug being black with white and brown markings, adult multi-coloured Asian lady beetles being round and ranging in colour from yellow to red, and adult 14-spotted lady beetles being yellow with approximately 14 square-shaped spots. Lady beetle larvae are dark in colour with bright orange markings and have an elongated body with long legs.

Predatory mites range in colour from yellow to red and are distinguishable from spider mites by their rapid movement and colouration. Minute pirate bug nymphs are yellow-orange to brown in colour and teardrop-shaped.

Lacewings go through four stages: eggs, larvae, pupae, and adults. Wolf spiders are common in hop yards, moving quickly near the bases of plants. Adult pink lady beetles are oval-shaped and 1/5 inch long, bright red to pink with six black spots on each wing cover. Lady beetle pupae are round in shape and usually have orange and black spots, often found attached to leaves.

Predatory mites, minute pirate bugs, and lacewings can be purchased online from suppliers listed at anbp.org/wp-content/uploads/2021/11/Guidelines_for_Natural_Enemies_2021.pdf. For more information on lady beetles, refer to the Buckeye Lady Beetle Blitz Identification Guide.

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1. The science behind conservation and pest management in hop cultivation involves nurturing natural predators such as predatory mites, lady beetles, lacewings, and parasitic wasps, to manage common hop pests.
2. In the realm of health-and-wellness and lifestyle,hop growers employ Integrated Pest Management (IPM) practices to monitor and enhance natural predators, using monitoring methods and cultural practices like scouting, habitat enhancement, and augmentative releases.
3. To foster a healthier environment and promote the sustainability of hop farming, hop growers integrate fitness-and-exercise and nutrition principles by avoiding broad-spectrum insecticides and practicing good sanitation in their hop yards.
4. In the field of education-and-self-development, understanding the life cycles of beneficial insects like lady beetles, predatory mites, and lacewings, helps hop growers apply appropriate conservation techniques and make informed decisions about pest management.
5. The power of technology is harnessed in hop pest management through resources like online purchases of natural predators from suppliers and educational materials like the Buckeye Lady Beetle Blitz Identification Guide and the Guidelines for Natural Enemies, accessible through websites such as anbp.org.

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