Category Archive: Pests

AAA shares pest information regularly, so that industry professionals and the public can stay informed and help protect Hawaii's trees.

Oct 25

Pest of the Month – October 2016

Pest of the Month Mamaki Rust (Pucciniastrum boehmeriae) Photos: Hawaii Department of Agriculture, Plant Pest Control Branch   Description: Mamaki rust was only recently observed for the first time in Hawaii. Distribution: Widespread in eastern Asia. On the Big Island, Hawaiian Acres, Kurtistown. On Oahu, in the Koolau Mountains. Hosts: First seen on endemic mamaki, aka mamake or waimea …

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Sep 25

Pest of the Month – September 2016

Pest of the Month South American Palm Weevil (Rhynchophorus palmarum) Photos: UC IPM Green Bulletin (Vol.6 No.2 August 2016) Description: This weevil is currently not in Hawaii; please help keep an eye out for it. The adult is ~1 ½ inch long, shiny black, with small hairs on its body and a typical weevil “snout”. The …

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Aug 25

Pest of the Month – August 2016

Pest of the Month — Verticillium Wilt   DESCRIPTION Verticillium wilt is caused by a variety of fungal species of the genus Verticillium, most notably V. dahliae and V. albo-atrum. It is “one of the most widespread and destructive soilborne diseases of plants” (UC IPM). Verticillium infects a plant through the roots and multiplies in the …

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Jul 25

Pest of the Month – July 2016

PEST ALERT – Diaprepes Root Weevil Photos: University of California Cooperative Extension (See Additional Resources below)   Distribution: The Diaprepes root weevil (Diaprepes abbreviatus) is currently not present on any Hawaiian islands. Native to Caribbean region, it was introduced into Florida in 1960s. The beetle is established in certain 
quarantine areas in Southern California (Los …

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Jun 25

Pest of the Month – June 2016

Pest of the Month – Chilli Thrips (Scirtothrips dorsalis) Description: Chilli thrips is a polyphagous species found in Oahu in 1987. Mature chilli thrips are less than 1-2 mm in length. Field identification should be confirmed by a professional entomologist. Hosts: Attacks over 100 species in 40 different Families, including crape myrtle, golden dewdrop, star jasmine, camellia, Indian hawthorn, Acacia spp., Ficus elastica, Schefflera …

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May 28

Pest of the Month – May 2016

Tea scale of camellia – Fiorinia phantasma Photos by Dr. Arnold Hara, University of Hawai’i, CTAHR   Tea scale of camellia is a polyphagous armored scale. These mussel-shaped scales are found on the underside of leaves, are up to 0.67mm in length, and often have horizontal red stripes across their backs. Large eggs found under …

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Apr 25

Pest of the Month – April 2016

Koa Wilt – Fusarium oxysporum All photos by Dr. J.B. Friday, University of Hawai’i, CTAHR                             Description The fungus Fusarium oxysporum lives in and blocks the xylem of Acacia koa and Acacia koaia, causing major dieback or tree death. Distribution Hawaii Island, …

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Jul 09

Pest Of The Month – Koa Rust (Atelocauda digital)

Pest of the Month – Koa Rust (Atelocauda digital) Hosts: Infects a wide range of Acacia species, including A. koa, mangium, auriculiformis, aulococarpa, crasicarpa, leptocarpa, mearnsii, and polystacha. Distribution: Occurs on all major Hawaiian islands except Lāna‘i. Damage: This rust disease is not fatal to koa trees. Severe symptoms (witches’ brooms) are mainly confined to several or …

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May 18

May 2015 – Pest of the Month

Monkeypod Round-Headed Longhorn Beetle – Xystrocera globosa Hosts: Wide range of species of wild and cultivated leguminous trees, (Mimosaceae, Papilonaceae), belonging to genera such as Acacia, Acrocarpus, Adenanthera, Adina, Albizzia, Bauhinia, Cassia, Duabanga, Haematoxylon, Parkia, Xylia, Paraserianthes, Samanea, and several Malvaceae (Grewia, Salmalia) and Rosaceae (Prunus). Distribution: Originates from Southeast Asia, and is widely distributed.  …

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Apr 07

Pest of the Month: Rapid Ohia Death

“Rapid Ohia Death” is a fungal pathogen called Ceratocystis. Altough newly discovered infecting Ohia, it has previously been found on other plants here including Okinawan sweet potato and taro as described in this recent article in the Hawaii Tribune Herald.

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