Larval stage of something on oak

Larval stage of something on oak

Observation - Larval stage of something on oak. Description: 3 different specimens of the larval stage of something attached close to the terminal buds of oak twigs (although the 3rd one looks like a piece of chewing gum)

3 different specimens of the larval stage of something attached close to the terminal buds of oak twigs (although the 3rd one looks like a piece of chewing gum)