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- Title
Chemotaxis of Adults of the Asiatic Citrus Psyllid, Diaphorina citri Kuwayama, to Volatile Terpenes Detected from Guava Leaves.
- Authors
Zaka, Syed Muhammad; Xinnian Zeng; Huatamg Wang
- Abstract
The Asiatic citrus psyllid, Diaphorina citri Kuwayama, is the most destructive insect pest of citrus. It causes severe damage to the crop by transmission of the pathogen of citrus Huanglongbing (HLB) disease. Previous researches have proven that the inter-planted guava trees, Psidium guajava L. (Myrtales: Myrtaceae), in citrus orchard showed positive effect on the reduction of psyllid infestation and the volatiles emitted from guava leaves exhibited repellent activities against the adult psyllids. To determine the active volatile compounds from guava leaves, present research deals with the detection and chemotaxis of volatile terpenes from guava leaves by GC-MS analysis and olfactometer bioassay. The GC-MS analysis of guava leaf volatiles revealed that 7 terpenes among the 21 volatile compounds were detected, i.e. α-pinene, sabinene, myrcene, β-pinene, β-ocimene, limonene and α-ocimene. The olfactometer bioassay with 3 commercial available volatile terpenes, limonene, α-pinene and β-pinene, against the adult psyllids showed that no significant chemotaxis effect was recorded when individual compounds or combination of (limonene + β-pinene) were tested. The combinations of α-pinene mixed with limonene, β pinene, or both of them at equal ratio, gave highly significant less chemotaxis response, 28.75%, 36.25% and 21.25% for female adults, respectively, indicating strong repellent activity of α-pinene combinations. The chemotaxis responses of male and female adult psyllids to the tested terpenes were similar. These results suggest that the blends of volatile terpenes from guava leaves contributed to the reduction of psyllid infestation in the guava-citrus intercropping system and might be developed as effective behavioral regulators of the adults of Asiatic citrus psyllid in practice.
- Subjects
CHEMOTAXIS; JUMPING plant-lice; BIOLOGICAL control of insects; CITRUS diseases &; pests; CITRUS greening disease; GUAVA
- Publication
Pakistan Journal of Zoology, 2015, Vol 47, Issue 1, p153
- ISSN
0030-9923
- Publication type
Article