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      • Two-Year Cycle Block Pruning Method by Aki Yamagishi
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    • 6/24 Coffee Desuckering & Vertical Selection Field Day - Maui
    • 6/28 Ka'u Coffee Project & Record Keeping Workshop - Ka'u
  • Hawaii Coffee Pests and Problems
    • Anthracnose
    • Banana Moth
    • Bird Damage
    • Black Twig Borer
    • Blister Spot
    • Cercospora Leaf Spot and Berry Blotch
    • Coffee Berry Borer
    • Coffee Root-knot Nematode
    • Food Safety Concerns - Slug, feces, etc.
    • Frost Damage
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    • Glyphosate Herbicide Injury
    • Green Scale and Sooty Mold
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    • Mite Feeding Damage
    • Nutritional Problems
    • Over-bearing Dieback
    • Rodent Damage
    • Skin Cracking
    • Slug and Snail Damage
    • Sunburn on Coffee
  • NKO - Coffee Pests and Diseases Not in Hawaii
    • Coffee Berry Disease - NKO
    • Coffee Leaf Miner - NKO
    • Coffee White Stem Borer - NKO
    • Coffee Wilt Disease - NKO
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    • Growing Coffee in Hawaii
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Coffee Root-knot Nematode


(Photos by Scot Nelson and Andrea Kawabata)
In Hawaii, there is one specie of root-knot nematode in particular, that affects coffee.  It is called Meloidogyne konaensis.  Coffee root-knot nematodes cause plants to display "flagging" or flaccid, droopy leaves, yellowing of leaves, and premature ripening or abortion of coffee cherry.  The amount of feeder roots and over all root mass will be reduced and those remaining may look swollen, stubby, and/or corky.  Coffee yield may be reduced by 20-25% or greater and plants can succumb to nematode infestation. It is not uncommon for growers to observe tree decline and tree death within the first three years after planting seedling trees.

Nematodes can be easily transported from farm to farm in soil, with pulapulas (coffee seedlings pulled from the 
ground) and larger coffee trees with roots, via down-flow of water, and with potted plants. Improperly and uncomposted materials may also be carriers of nematodes.

​Root-knot nematode and over-bearing dieback 
​​can sometimes be confused with each other as symptoms look similar.  Root and soil sampling can help to identify nematode problems.  In addition, plant decline and death can be exacerbated by a combination of both problems.  Due to poor root structure and supporting feeder roots, broadcasting fertilizers and providing irrigation may not save a dying tree or turn yellowing leaves green on plants affected by root-knot nematode.  However, foliar fertilizers can help increase nutrient levels in the plant when roots are damaged. Replanting with grafted, root-knot nematode resistant or tolerant plants is recommended.
Find additional information on coffee root-knot nematode by clicking on the links below:
  • Grafted Coffee Increases Yield and Survivability (Myers et al. 2020)
  • A Pictorial Guide to Coffee Grafting (Kawabata et al. 2019)
  • Kona Coffee Root-knot Nematode Sampling Procedures - (Kawabata et al. 2018)
  • Nutrient and Nematode Status of Coffee and Soils from Orchards in Hawaii - (Hue et al. 2007)
  • Managing Coffee Nematode Decline (Nelson et al. 2002)​​
  • The Case of the Nematode Nemesis (Part 1 of 2) Video (Bittenbender 2002)
  • ​The Case of the Nematode Nemesis (Part 2 of 2) Video (Bittenbender 2002)
  • Fukunaga, a Coffee Rootstock Resistant to the Kona Coffee Root-Knot Nematode (Bittenbender et al. 2001)
  • The Economics of Producing Grafted Coffee Plants  (Fleming et al. 2001)
  • ​Parasitic Nematodes and Their Management (and Sampling for Nematodes) (Schmitt & Sipes 2000)
  • Kona Coffee Root-knot Nematodes: Disease Symptoms and Management (PPT by Scot Nelson)
  • Coffee Decline Caused by the Kona Coffee Root-Knot Nematode (Serracin et al. 1999)
  • Description of the Kona Coffee Root-knot Nematode, Meloidogyne konaensis n. sp. (Eisenbeck et al. 1994)
Click here for potential resources of grafted coffee trees with resistance to root-knot nematode.
Click here to view a video on coffee grafting by Greenwell Farms. ​
​(Mention of a trademark, business, or proprietary name does not constitute an endorsement, guarantee, or warranty by the University of Hawaii Cooperative Extension Service or its employees and does not imply recommendation to the exclusion of other suitable products or businesses. )

Collecting Plant Disease and Insect Pest Samples for Problem Diagnosis
Learn how to best collect and submit disease, insect pest and nematode samples to the UH Agricultural Diagnostic Service Center (ADSC) for diagnosis. Click here for ADSC analytical service fees.

Coffee Leaf and Soil Sampling
Learn how to correctly sample and submit coffee leaf and soil samples for proper analysis of plant nutritional status and soil pH and nutrient status.

Contact website management if you require any assistance with the site or information provided.
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  • Home
  • Coffee Leaf Rust
    • Coffee Leaf Rust Photos
    • HDOA CLR Pest Alert >
      • HDOA CLR Report Form
    • Sanitation and Disinfestation Info
    • Coffee Tree Health and Nutrition
    • Surveying, Sampling and Monitoring of CLR >
      • HDOA CLR Field Guide and Submission Form
    • Spraying for CLR and Spray Product Info >
      • Spraying for CLR - English
      • Pulverización para CLR - Español
      • Spraying for CLR - Tagalog
      • Spraying for CLR - Ilocano
      • Sprayer Calibration and Pesticide Calculations
      • Priaxor Xemium Info
      • ProBlad Verde Info
      • Pesticide Use FAQs
      • Biostimulant Products
    • Pruning for CLR and CBB
    • Coffee Leaf Rust Poster >
      • La Roya del Café Póster - Español
      • Coffee Leaf Rust Poster - Tagalog
      • Coffee Leaf Rust Poster - Ilocano
    • CLR Trifold Brochure
    • CLR Presentations and Meetings
    • CLR Publications
    • CLR/CBB Subsidy Program Info
    • Certis BotaniGard and Mycotrol Compatibility Chart
  • CBB Management
    • Field Sanitation
    • Pruning >
      • Two-Year Cycle Block Pruning Method by Aki Yamagishi
    • Feral and Unmanaged Coffee Trees
    • Field Monitoring
    • CBB Control >
      • Predators of CBB
    • Harvesting
    • Shipping
    • Beauveria Subsidy Program Info
    • Certis BotaniGard and Mycotrol Compatibility Chart
    • 2020 CBB IPM Document
    • CBB & Coffee Presentations & Posters
    • CBB Publications
  • Events and Announcements
    • 6/24 Coffee Desuckering & Vertical Selection Field Day - Maui
    • 6/28 Ka'u Coffee Project & Record Keeping Workshop - Ka'u
  • Hawaii Coffee Pests and Problems
    • Anthracnose
    • Banana Moth
    • Bird Damage
    • Black Twig Borer
    • Blister Spot
    • Cercospora Leaf Spot and Berry Blotch
    • Coffee Berry Borer
    • Coffee Root-knot Nematode
    • Food Safety Concerns - Slug, feces, etc.
    • Frost Damage
    • Fruit Fly
    • Glyphosate Herbicide Injury
    • Green Scale and Sooty Mold
    • J-rooting
    • Little Fire Ant
    • Mite Feeding Damage
    • Nutritional Problems
    • Over-bearing Dieback
    • Rodent Damage
    • Skin Cracking
    • Slug and Snail Damage
    • Sunburn on Coffee
  • NKO - Coffee Pests and Diseases Not in Hawaii
    • Coffee Berry Disease - NKO
    • Coffee Leaf Miner - NKO
    • Coffee White Stem Borer - NKO
    • Coffee Wilt Disease - NKO
  • Coffee Publications and Presentations
    • Growing Coffee in Hawaii
  • Coffee Leaf and Soil Sampling Instructions
  • HDOA Rules - Coffee
  • USDA - Coffee Rules
  • Coffee Organizations in Hawaii
  • Agricultural Theft
    • Chapter 145 - Reg. of Farm Product
    • Dealer Licensing
    • Contacts
  • Coffee Crop Insurance
  • Archive
  • About us
  • Blog
  • New Page