Fig. 1: HLB-affected periwinkle plants before and after heat treatment.
From: Molecular mechanisms underlying heat or tetracycline treatments for citrus HLB control

a Heat treatment at 42 °C for 10d (a1: before; a2: 3 months after); b heat treatment at 45 °C for 3 days (b1: before; b2: 3 months after). c No heat treatment control (c1: before; c2: 3 months after)