Cucumber Beetle Biology and Control in Melons. Diane Alston Entomologist Utah State University Melon Growers Meeting Green River, UT January 31, 2006
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1 Cucumber Beetle Biology and Control in Melons Diane Alston Entomologist Utah State University Melon Growers Meeting Green River, UT January 31, 2006
2 Cucumber Beetles Chrysomelidae Leaf Beetles Western Striped CB (Acalymma trivittatum) Spotted CB (Diabrotica undecipunctata) Pests of cucurbits Feed on leaves, stems, roots, & fruits Transmit bacterial wilt & squash mosaic virus
3 CB Biology Adults overwinter in protected sites near agricultural fields Under plant debris, in crevices of buildings, fence posts, etc. Spring - active when temperatures >50ºF Feed on pollen & nectar Can fly long distances Feed on seedling cucurbit plants Cucumber, cantaloupe, winter squash, pumpkin, gourds, summer squash, watermelon, many others
4 CB Life Cycle Adults mate in spring Females lay 200-1,200 eggs Prefer to lay eggs in moist soil at base of host plants Larvae hatch in 7-10 days Larvae feed on roots for 3-6 wk Pupate in soil Summer adults emerge (1 or 2 gens.)
5 Injury to Melons Spring Adults Feed on stems, cotyledons stunt or kill young plants Spread bacterial wilt 1 st generation Larvae Feed primarily on roots stunt plants Ample moisture reduces injury Summer Adults Feed on leaves, flowers, stems, fruit Summer Larvae Feed on roots & fruit
6 Management Program Population monitoring Cultural practices Trap crops, trap baits, sticky traps Natural Enemies Insecticides
7 Spring Population Monitoring Determine when spring adult invasion begins Scout field 2X per wk when plants <5 leaves Look on undersides of leaves & stems Cucumbers & cantaloupe susceptible to bacterial wilt 1 beetle per plant Watermelon not susceptible to wilt 5 beetles per plant Place yellow sticky traps on edges of field
8 Cultural Practices Delayed planting Post egg-laying (June?) Row covers Mulching Aluminum-coated plastic mulch Deter egg-laying near stems Hinder larvae migrating to fruits Limit irrigation when fruit nears ripening Cultivation & residue removal after harvest Insect vacuuming
9 Trap Crops High concentrations of cucurbitacin &/or floral volatiles Plant on field perimeters as border strips Plant 2 wk before crop Treat trap crop with insecticides to kill migrating adults 2-5% of land Highly attractive summer & winter squash
10 Trap Baits Bait + insecticide Cucurbitacin feeding attractant Eugenol pheromone Cucurbit floral volatiles host finding attractant Commercial attractants Developed for Diabrotica spp. Cidetrack feeding stimulant Adios & Slam cucurbitacin + carbaryl
11 Sticky Traps Yellow sticky traps Pherocon AM trap Add kairomone lure Pherocon CRW Kairomone trap (for Diabrotica) Place on borders
12 Natural Enemies Soldier beetle Parasitic wasps Ground beetles Entomopathogenic nematodes
13 Insecticides Registered for Cucumber Beetle in Utah Nicotinoids Imidacloprid (Admire) - systemic Pyrethroids Cypermethrin (Ammo, Mustang) Permethrin (Pounce, Ambush) not watermelon Bifenthrin (Capture, Brigade) Esfenvalerate (Asana) Cyfluthrin (Tempo) Lamda-cyhalothrin (Warrior) Carbamates Carbaryl (Sevin) Methomyl (Lannate) Organophosphates Azinphosmethyl (Guthion) Chlorpyrifos (Lorsban) Methyl parathion (Penncap- M) Oxydemeton-methyl (Metsystox-R) Diazinon Malathion Organochlorines Endosulfan (Thiodan) Methoxychlor (Marlate) Inorganics Cryolite (Kryocide) Kaolin clay (Surround)
14 Insecticide Application Coverage Cover undersides of leaves, stems, drench soil surface Timing Start before severe adult damage in spring Summer treatment if populations are high Target adults (Nicotinoid, Pyrethroid, Carbamate) Target eggs & larvae (Organophosphate, Organochlorine or Others) Use full label rate Rotate insecticide classes prevent resistance
15 Contact Diane Alston Utah State University 5305 Old Main Hill Logan, UT Voice: Web site:
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Master Gardener Volunteer Program Level 1 Training Plant Presentation-Final Exam 1. Common Name: a. Asparagus 2. Scientific name: a. Asparagus officinalis, genus of the family Asparagaceae 3. Cold hardiness