Yufan Zhang spraying glycerol foliar treatment

Yufan Zhang spraying glycerol foliar treatment

Yufan Zhang sprays glycerol foliar treatment.

Yufan Zhang sprays a glycerol treatment on the leaves of a Theobroma cacao tree as Siela Maximova and Mark Guiltinan look on. The three Penn State scientists are aiming to find a safer way to combat diseases threatening the world's cocoa crop.

Image: Seth Palmer