POTATO.CPB.NEAL.1989

 
METHOD: Test Diet CONDITIONS: Green House - 16h light at 20-26C and 60-90% RH METHOD NARR: Ber leaflets were dipped in methanol to remove type B exudate. Wiping with a cotton swab removed most of the type A trichomes as well asdate. These leaflets were placed in petri dishes and larvae were allowed to feed. Sucrose esters were prepared from a difference accession of ber. These esters were coated on methanol-dipped ber discs or untreated tbr disc neonate L1's failed to feed when given ber leaflets for 72 hr. Mortality was restricted to those that did not feed or fed very little indicating starvation. Removal of ber trichomes improved both feeding and survival. Methanwith sucrose esters lowered feeding to levels of untreated disks. This effect was reversed with removal of type A trichomes indicating they work in concert. Type B exudate inhibits feeding only in the presence of type A trichomes. Tof allelochemical in ber foliage that adversely affect feeding. AUTHOR EXPLANATION: The sucrose esters are not normally distributed uniformly on foliage, but are concentrated in droplets on the tips of type B stalks. Ee A trichomes had been removed, L1's grew less rapidly than on tbr. This could be due to either a lower nutritional quality of ber foliage, or reduced consumption rate or a combination of the two.
Trait(s) evaluated
Citation(s)
  • Neal, J. J., J. C. Steffens, & W. M. Tingey. 1989. Glandular trichomes of Solanum berthaultii and resistance to the Colorado potato beetle. Entomol. Exp. Appl. 51:133-140.