Asian Science Citation Index is committed to provide an authoritative, trusted and significant information by the coverage of the most important and influential journals to meet the needs of the global scientific community.  
ASCI Database
308-Lasani Town,
Sargodha Road,
Faisalabad, Pakistan
Fax: +92-41-8815544
Contact Via Web
Suggest a Journal
Journal of Applied Sciences
Year: 2014  |  Volume: 14  |  Issue: 24  |  Page No.: 3472 - 3478

Herbivore-Plant Interactions: Case of Zonocerus variegatus and Chromolaena odorata in Ghana

J.A. Timbilla and B.W. Lawson    

Abstract: In Sub Saharan Africa seasonal outbreaks of Zonocerus variegatus coincide with the introduction of the neophyte Chromolaena odorata. Zonocerus variegatus is known to feed on the flowers of C. odorata which contain Pyrrolizidine Alkaloids (PAs), known to protect the grasshopper. A study was carried out with the objective to establish any possible link between the introduction of C. odorata and the outbreak of Z. variegatus. Questionnaire and field surveys were carried out in Ghana to determine the distribution, density and pest status of Z. variegatus and C. odorata and also to assess the seasonal populations of Z. variegatus with respect to the occurrence of flowers of C. odorata. The results indicated that C. odorata has spread as far north as latitude 8°30', an increase of 15' within a decade. The occurrence, density and outbreak of the dry season population of the uni-voltine Z. variegatus are related to the distribution of C. odorata which is also dependent on the rainfall pattern. In areas with dry season outbreaks of Z. variegatus, C. odorata occurs and the rainfall pattern is bi-modal. In the north where C. odorata is absent with only one population of Z. variegatus, the latter assumes pest status in isolated spots. The results indicate a strong linkage between the outbreak of dry season populations of Z. variegatus and the presence of Pas from the flowers of C. odorata, thus proving the existing pharmacophagous relationship proposed between the insect and the weed.

Cited References   |    Fulltext    |   Related Articles   |   Back
  Related Articles

Copyright   |   Desclaimer   |    Privacy Policy   |   Browsers   |   Accessibility