Silent danger lurks

Courtesy state Department of Land and Natural Resources file

Researchers and land-management personnel from a variety of organizations gather together to learn about rapid ‘ohi‘a death detection and response.

Kim S. Rogers / Kaua‘i Invasive Species Committee

A tree possibly infected by rapid ʻohiʻa death is seen from a helicopter during a survey of the disease’s possible spread on Kaua‘i.

Kim S. Rogers / Kaua‘i Invasive Species Committee

The coqui frog is a small tree frog larger than 1 inch long. It has a round body shape. The coloration is variable from light yellow to dark brown, with broad rounded snouts with obvious toe pads. The frog has caused an estimated $3 million dollars in damages because it has no natural predators.

Kim Starr / Kaua‘i Invasive Species Committee

Miconia may be a familiar sight and name. The trees grow quickly and close together, shading out nearly all other forest plants with their large, oval leaves. It also has a shallow root system and can cause increased erosion and landslides. Miconia quickly matures, producing fruit after three to four years and flowers and fruits several times a year. Plants produce 10 to 20 million seeds a year, which can remain viable for 12 years and possibly longer.

Courtesy Kaua‘i Invasive Species Committee

The ivy goard vines grow over and smother vegetation, and cover fences and power lines. It threatens natural and managed areas. It is extremely difficult to control because plants regrow from deep roots even after treatment with herbicide. Although ivy gourd requires cross-pollination between male and female plants, it is able to spread quickly and can grow up to four inches per day.

Courtesy Kaua‘i Invasive Species Committee

Long-thorn kiawe can grow as a rambling shrub or tree ranging from 6 feet to 30 feet tall. The thorns are up to 4 inches long. It’s pale yellow flowers are numerous, and grow in cylinder-shaped spikes up to 4 inches long. Mature seed pods are flat, curved, yellowish brown and 3 inches to 8 inches long.

Courtesy Kauaʻi Invasive Species Committee

The African tulip, Spathodea campanulata, is an East African native which has been in Hawaiʻi for a long time. Renowned physician and botanist William Hillebrand first planted African tulip trees in Hawaiʻi in the late 1800s.

Kim Starr / Kaua‘i Invasive Species Committee

The fruit of Himalayan ginger is a tasty treat for non-native birds, but this means the seeds are spread throughout the forest.

Courtesy Kauaʻi Invasive Species Committee

False kava has a thick growth habit and spreading root suckers which displace other plants. Since it can be easily confused with true kava it is sometimes mistakenly interplanted, which then threatens the purity and preservation of true kava, vastly decreasing the value of the crop and the quality of the product. False kava does not have the same medicinal properties as true kava. False kava grows twice as fast as true kava and quickly takes over the habitat.

KAPA‘A — The Kaua‘i Invasive Species Committee’s mission continues to evolve with the ever-changing ecosystem, which the Kapa‘a-based nonprofit organization was built to protect.

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