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Plant Protection - A Growing Trend: Ornamental and Vegetable Crops (Tech Tip )
By Nancy Rechcigl, Technical Services Manager

The popularity of outdoor and patio gardening continues to show an upward trend. In addition to growing some of the new exciting varieties of bedding plants, many ornamental growers have begun to grow vegetable plants as part of their product offering. Since seedlings, plugs and finished crops may be sharing similar production space, it is important to keep in mind that many of the same pests and pathogens that affect ornamentals can also be a problem in your vegetable crops. With fewer products registered for use on vegetable transplants, careful attention to sanitation, scouting and cultural management become even more important.

Thrips can easily be carried over in the greenhouse from overlapping production of crops. In addition to the physical scarring of foliage and fruit, they can transmit tospoviruses such as impatiens necrotic spot virus (INSV) and tomato spotted wilt virus (TSWV). Both tomato and pepper plants are particularly sensitive to TSWV. Many ornamental crops such as begonia, New Guinea impatiens, lobelia, verbena and vinca can also serve as hosts for both viruses and thrips. It is important to scout all crops closely for any unusual markings (mottling, ring spots, etched patterns, black streaks on leaves and stems) as these viruses can be expressed differently depending on the crop. It is also important to scout for aphids (check young growing tips) which can also sneak into production areas in the spring. They often build up populations very quickly and are known for transmitting potyviruses (PVY) and cucumoviruses (CMV). Monitoring the production area with sticky cards will help you assess the presence and pressure of flying pests so you can be ready with corrective actions. Use of yellow sticky cards allows broad monitoring of thrips, aphids, leafminer, whitefly, fungus gnats and shore flies. Blue sticky cards can be used in conjunction with yellow sticky cards if thrips and tospoviruses are a primary concern.

Other viruses such as tobacco mosaic virus (TMV) and tomato mosaic virus (ToMV) can be a problem in solanaceous crops such as petunia and calibrachoa. These can easily be transferred to other ornamental and vegetable plants by handling or pruning tools. Properly sanitizing growing areas, hands, and cleaning tools between crops is critical to prevent the introduction and spread of these diseases. If possible, scout solanaceous crops last, being sure to use and change gloves between each crop.

Pests such as leafminers, whiteflies and two-spotted spider mites can easily move from ornamental to vegetable crops or vice-versa. Careful production planning such as crop placement in the greenhouse and plant spacing can help reduce the transfer and spread of these pests between susceptible crops.

While powdery and downy mildew diseases tend to be host specific, there are pathogens with broader host range that affect both ornamentals and vegetable crops. Knowing which crops are susceptible can help you develop a plan to avoid surprise outbreaks and unnecessary losses. Diseases caused by Phytophthora spp. can be problematic for both ornamental and vegetable crops, particularly tomato plants. While Phytophthora spp. are known primarily for causing root, crown and stem rots in ornamental plants, Phytophthora infestans can cause a severe foliar blight in tomatoes called late blight. This disease can occur quickly when the environmental conditions are right resulting in an unsalable crop.

Pest and Disease Problems That Affect Ornamental and Vegetable Crops

Pest & Disease

Ornamental Crop

Vegetable Crop

Leafminer

Pot Mums, Garden Mums, Gerbera, Dahlia

Solanaceous Crops: Tomatoes, Peppers, Beans

Whitefly

Poinsettia, Gerbera, Dahlia, Verbena

Solanaceous Crops: Tomatoes, Peppers, Beans

Two-spotted spider mite

Roses

Solanaceous Crops: Tomatoes, Peppers, Beans

Broad mite

Cyclamen, Dahlia, Fuchsia

Tomatoes, Peppers, Beans

Powdery mildew

(Podosphaera xanthii)

(Erysiphe cichoraearum)

Wide host range including: Petunia, Phlox, Verbena, Coreopsis, Helianthus, Aster

Cucurbits

Downy Mildew

(Peronospora parasitica)

(Bremia lactucae)

Alyssum, Iberis, Erysimum, Stock

Osteospermum

Brassica Crops - Kale, Cabbage, Broccoli

Lettuce

Syngenta offers Micora ® Fungicide , Flagship ® 25WG Insecticide and Bioline ™ Biological Control Agents as options for your ornamental and vegetable crop needs.

Crop

Micora

Flagship 25WG

Ornamentals

(Foliar applications)

Downy Mildew

Peronospora spp.

Plasmopara spp.

Bremia lactucae

Phytophthora Foliar & Stem Rot

Phytophthora spp.

Aphids

Leaf-feeding Beetles

Leafminers

Mealybugs

Thrips - (Foliar- feeding)

Whiteflies

Ornamentals

(Drench applications)

Phytophthora Root & Stem Rot

Phytophthora spp.

Aphids

Fungus Gnats

Leaf-feeding Beetles

Leafminers

Mealybugs

Root Aphids

Soft Scales

Thrips - (Foliar- feeding)

Whiteflies

Leafy Vegetables & Brassica Crops

(See label for full listing)

Downy Mildew

Peronospora spp.

Plasmopara spp.

Bremia lactucae

Fruiting Vegetables

Peppers,

Eggplant,

Tomatoes

(See label for full listing)

Downy Mildew

Peronospora spp.

Plasmopara spp.

Bremia lactucae

Phytophthora Blight

Phytophthora capsici

Late Blight

Phytophthora infestans

Aphids

Flea Beetles

Leafhoppers

Whiteflies

Pepper Weevils

Stink Bugs

Cucurbit Vegetables

(See label for full listing)

Aphids

Leafminers

Whiteflies

Flea Beetles

Cucumber Beetles

See product labels for complete listing of crops, use rates and application instructions

Pest

Biological Control Agents

Aphids

Aphiline™ c

Aphiline™ ce (mix of Aphidius colmani & A. ervi)

Aphidoline™ a

Leafminer (Dipterous)

Digline™ i

Whiteflies

Eretline™ e - Bemesia spp.

Encariline™ f - Trialeurodes spp.

Swirskiline™ as

Two-spotted mites

Phytoline™ p

Anderline™ aa

Amblyline™ cal

Broad mites

Anderline™ aa

Amblyline™ cu

Thrips

Amblyline™ cu

Swirskiline™ as

Hypoline™ m

Oriline™ i

Exhibitline™ sf

Fungus Gnats

Exhibitline™ sf

Hypoline™ m

All photos are the property of Syngenta unless otherwise noted.
©2014 Syngenta. Important: Always read and follow label instructions. Some products may not be registered for sale or use in all states or counties. Please check with your state or local Extension Service to ensure registration status. The trademarks displayed or otherwise used herein are trademarks of a Syngenta Group Company or third parties.

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