| Publication Type: | Journal Article |
| Year of Publication: | 1985 |
| Authors: | A. K. Chakravarthy, Rao D. K. A. |
| Journal: | Insect Science and its Application |
| Volume: | 6 |
| Date Published: | 1985 |
| Keywords: | Amrasca, Amrasca biguttula biguttula, Bemisia, Bemisia tabaci, comparison, cotton, cotton plants, dispersal, dispersal patterns, dispersal patterns on plant, distribution on plant, distribution within habitat, food plant, food plants, Gossypium hirsutum, India, Ludhiana, patterns on food plant, plant and vegetation habitats, population sampling, Punjab, sampling method, sampling method comparison |
| Abstract: | Spatial dispersion of the nymphs of the jassid, Amrasca biguttula biguttula (Ishida), and the adults of the whitefly, Bemisia tabaci Genn. on F414, a Gossypium hirsutum variety, was systematic in Ludhiana (Punjab, India). Both the jassid and the whitefly displayed no definite pattern along the height of the plant, though a maximum number of whiteflies were recorded at middle canopy (21-40 cm from bottom). Samples sizes of 10-15 plants, selected in a statistically linear fashion represented populations of jassid nymphs and adult whitefly on all four varieties. Sampling jassid nymphs by visual counting and whitefly b split-cage were the most suitable sampling methods for local cotton growers among the various methods compared. |