June 2012 archive

Jun 27

Pest of the Month February 2011 – Cotton Lace Bug

Hosts:  Fabaceae, Malvaceae, Annonaceae, Solanaceae Families – soursop, castor bean, orchid tree, awikiwiki, coral tree (E. crista-galli), Indian coral tree, wiliwili, red hibiscus, ulu, paper mullberry, white sapote, a’e (soapberry), akia, royal palm, kapok, croton, guava, angel’s trumpet Distribution: Southern U.S., Mexico to Ecuador, West Indies, and Hawaii. Symptoms:  Leaf stippling to yellowing to bleaching …

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Jun 27

Pest of the Month January 2011 – Palm Bud Rot and Palm Stem Rot

Pathogens: Phytophthora palmivora and Thielaviopsis paradoxa (a.k.a. Chalara paradoxa – see Pest of the Month February 2009 – Stem Bleeding of Coconut) Hosts:  Fishtail palms, pineapple, coconut, Dracaena fragrans, Ficus spp., Phoenix spp., Rhapis sp., royal palm, cabbage palm, sugarcane, queen palm, Manila palm, Washingtonia spp., aglaonema, Syngonium podophyllum Distribution: California, Florida, Arizona, Hawaii, and …

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Jun 27

Pest of the Month November 2010 – Red Palm Weevil (Pest Alert)

Hosts:  24 species of palms in 14 genera, including most of the common landscape palms found in California Distribution: Asia, Africa, Middle East, Europe, Australia, Samoa, Papua New Guinea, Solomon Islands, Aruba, and U.S. – Laguna Beach, Orange County Symptoms:  Larval mines and frass in leaf based in the central growing point of the palm, …

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Jun 27

Pest of the Month October 2010 – Algal Leaf Spot

Cephaleuros spp. Hosts:  Guava, magnolia, coffee, avocado, mango, breadfruit, coconut, cacao, citrus, and others Distribution: Tropical and subtropical climates and on all continents and probably all islands between 33°N and 33°S of the equator where temperature and humidity are suitable for growth. Symptoms:  For C. virescens,  leaf spots on the upper leaf surface, raised and …

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Jun 27

Pest of the Month September 2010 – Citrus Leaf Miner

Hosts:  species of Citrus and related Rutaceae Distribution: Hawaii, California, Florida, most of Africa, Australia, Saudi Arabia to India, Indonesia, China, Philippines, Taiwan, southern Japan, New Guinea and nearby Pacific Islands Symptoms:  Serpentine mines in leaves and rarely in fruits, curling of leaves.  Young leaves are susceptible.  Succulent branches of young shoots may also be …

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Jun 22

Pest of the Month August 2010 – Cuban Laurel Thrips

 Host:  Ficus sp., citrus, and occasionally orchids Distribution: Hawaii, Florida, California, Texas, Guam, and other tropical areas Symptoms:  Sunken purplish spots along midrib and tight curling of young leaves, which become hard and tough and eventually fall off.  Young leaves are susceptible. Management:  Biological control including green lacewing larvae and ladybird beetles.  For ornamental trees, …

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Jun 22

Pest of the Month July 2010 – Colletotrichum Leaf Spot on Red Sealing Wax Palm

Host:  Red sealing wax palms (Cyrtostachys renda Blume) Symptoms:  Small, water-soaked dark green spots that expand into circular spots with tan to light brown centers bordered by water-soaked tissue on foliage.  The size of necrotic areas increases as spots coalesce.  Young leaves are susceptible.  Leaf petioles and sheaths are also infected. Spread by: water splashing …

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Jun 22

Pest of the Month June 2010 – Monkeypod Moths

Monkeypod Moths (Melipotis indomita, Ascalapha odorata, and Polydesma umbricola) Distribution:  all major Hawaiian Islands Hosts:  Monkeypods (M. indomita also attacks kiawe) Symptoms:  Defoliation.  Webbing with frass on trunk bark. Management:  Management is not usually necessary.  If a tree is particularly stressed, insecticide can be applied to the trunk bark. Sources: Description and Life Cycle of …

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Jun 22

Pest of the Month May 2010 – Pacific Beetle Roach

Distribution: Asia, Pacific Islands, and Hawaii Hosts: Cypress and juniper Symptoms:  Dead areas in crowns (orange/brown).  Roaches girdle branches by eating the bark. Management:  Remove leaf litter from crown and below tree (nesting area for roaches). Sources: Pacific beetle mimic Diploptera punctata Norfolk Island Pine Culture, University of Hawaii Cooperative Extension Service Circular 453, March 1972, p. …

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Jun 22

Pest of the Month April 2012 – Black Twig Borer

Black Twig Borer Xylosandrus compactus (Eichoff) Distribution: Hawaiian Islands. Native to Asia, found in coffee growing areas of the world Hosts:  Over 200 plant species including coffee, avocado, citrus, cacao, paperbark, Eucalyptus robusta, haole koa, guava, Christmasberry, lychee, macadamia, mango, mahogany, hibiscus, kukui,Surinam cherry, and podocarpus. Symptoms:  Pin-sized entry holes, twig death.  Severe infestations can kill …

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