Indonesia Conference Directory

CVPD or greening disease is the most devastating disease on citrus production in Indonesia and in the world. It is vectored by Asian citrus psyllid (Diaphorina citri). Guava leave extract is a prospective control means for reducing psyllid population. Research was conducted to investigate the repellent effect of guava shoots to psyllids. Repellent effect of grinded dried upper shoot (leaf number 1 and 2 from the top) of 50oC and 80oC of red, white, and non-seed guava shoots to ten adult psyllids of mixed gender were determined in Y-tube olfactometer. Variation of proportion of guava leaf : citrus leaf (0:3; 1:1; 1:2; 2:1; 3:0) of guava shoots which have highest repellent effect also tested to the psyllids. The result shows that guava shoots has repellence effect to psyllids adult. The effect is reduced as the increase of drying temperature. Highest repellence effect is found from red guava shoots, followed by non-seed guava and white guava. Repellent effect of upper red guava shoots was 63.3%, 73.3%, and 76.7% on the proportion of 1:2, 1:1, and 2:1 respectively. It is suggested that the highest repellent properties is in red guava shoots and the ability will decrease in line with the increasing of drying temperature. The repellency is dose dependent. It increase with the increasing of guava leaf proportion.