You could spot one or two, then dozens around the same tree. Oak galls are the result of gall wasps. Inside the galls are the insect's eggs and larvae. When the eggs are first laid, the galls will ...

Erythrina gall wasps, mostly yellow, 6- to 8-millimeter-long invasive pests, create galls — swollen, tumor-like growths — in erythrina tree tissue that serve as cocoons for their larvae to mature.

The invasive gall wasps were first discovered on Oahu in 2005. They spread quickly throughout the state and resulted in the death of thousands of Erythrina trees, including native wiliwili trees.

But they do have more than their share of pests and diseases; there’s one in particular that needs to be controlled, the ...

And there are some unimaginably complicated life stories. Tiny gall wasps lay an egg or eggs on a plant’s shoots or leaves. The plant is induced to produce a distinctively shaped protective ...

But the fear is to relive what already happened in the previous phytosanitary emergency, when the gall wasp caused a vertical collapse in revenues: from over 850,000 euros in 2013 to just over ...