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Insect release proposed to control exotic strawberry guava
Date:5/22/2008

U.S. Forest Service scientists with the Institute of Pacific Islands Forestry have submitted a proposal to release a Brazilian insect to control the spread of strawberry guava, a South American tree that has invaded and degraded native Hawaian ecosystems since it was introduced in 1825 as a garden plant.

The scientists are working in collaboration with the Hawai Department of Land and Natural Resources, and Hawai Department of Agriculture, agencies responsible for issuing permits authorizing release of the insect on Hawaian Islands. Initial release of the insect is proposed for this summer in the Olaa Forest Reserve on the Big Island.

Land managers are particularly concerned about the plant because it has potential to invade nearly half the states land area, forming dense thickets that crowd endangered native species and impede access to residential property. Past control methods have been limited to removal by hand, herbicides and bulldozers.

Strawberry guava also affects Hawaian cultural practitioners who can no longer collect native plants once found in abundance in forests. In addition, it hosts non-native fruit flies that have cost the state billions of dollars in lost agricultural revenue.

Institute of Pacific Islands Forestry scientists were tasked with finding a biocontrol agent for strawberry guava to protect remaining native ecosystems, improve control of fruit flies and reduce dependence on chemical herbicides. Biocontrol agents in Hawai have been used for more than a century, including for control of prickly pear cactus, lantana, banana poka and ivy gourd.

Non-native plants became invasive in Hawai because they escaped the animals, insects and diseases that naturally kept them in check so the scientists traveled to Brazil where insects evolved to prey specifically on the tree.

Field research yielded the insect Tectococcus ovatus, or the Brazilian scale, which hatches nymphs that settle on strawberry guava leaves, indu
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Contact: Roland Giller
rgiller@fs.fed.us
510-559-6327
US Forest Service, Pacific Southwest Research Station
Source:Eurekalert

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