Naio Thrips

In March 2009, samples of heavily galled naio, Myoporum sandwicense, were collected from the Waikoloa area of Hawaii Island.  From these samples, a tiny, 2-2.5 mm long, black insect commonly known as thrips were collected.  This thrips, having a Hawaii common name of "naio thrips" is known in California as the "myoporum thrips."

On the island of Hawaii, infestations of naio thrips are known on the north-western part of the island from Kona Palisades through Waikoloa and up to Waimea (map).  The thrips have been observed attacking both the prostrate (naio papa) and upright forms of the indigenous Myoporum sandwicense.  Feeding by the thrips results in severe gall-like distortion of new leaves and stunting of terminals.  They can be found within the folds or curls of damaged leaves.  Continuing Statewide surveys have not revealed the presence of naio thrips on other neighboring islands. 

Suspected infestations of the naio thrips in areas other than the Big Island should be reported to the State's toll-free Pest Hotline at 643-PEST (7378).

The following are links to information relating to naio thrips:

• HDOA New Pest Advisory - Naio Thrips, 6/30/09
• Map - naio thrips distribution on Hawaii Island, 7/1/09
• Presentation - Naio (Myoporum) THrips, Dr. Arnold Hara, 5/14/09
• San Marcos Growers - Myoporum Thrips