W.H. White

Publications (5)4.76 Total impact

• Source

  Available from: usda.gov

  Article: Categorizing sugarcane cultivar resistance to the sugarcane aphid and yellow sugarcane aphid (Hemiptera: Aphididae).

  W Akbar, A T Showler, T E Reagan, W H White
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  ABSTRACT: Sugarcane (Saccharum spp.) in Louisiana is colonized by two aphid species, the sugarcane aphid, Melanaphis sacchari (Zehntner), and the yellow sugarcane aphid, Sipha flava (Forbes) (Hemiptera: Aphididae). The main problem associated with M. sacchari is transmission of sugarcane yellow leaf virus, a casual agent of yellow leaf disease whose absence has been added to certification standards for micropropagated sugarcane in Louisiana. Greenhouse studies were conducted to categorize dominant commercial sugarcane cultivars for their ability to tolerate aphid injury and to express antixenotic or antibiotic effects on both aphid species. Antixenosis tests showed no preference among cultivars by either aphid species. Loss of chlorophyll content in tolerance tests also did not show differences among cultivars for both aphid species. However, antibiosis tests revealed that life history parameters such as the duration of the reproductive period and fecundity of both aphid species were negatively affected on 'HoCP 91-555' compared with 'L 97-128'. Estimation of demographic statistics indicated that both aphid species exhibited a significantly lower intrinsic rate of increase (1.8-2.8-fold) and longer doubling time (1.7-3.1-fold) on HoCP 91-555 relative to L 97-128. From these tests, cultivars in the current study can be ranked from most to the least susceptible as L 97-128 > 'LCP 85-384' > 'HoCP 96-540' > 'Ho 95-988' > HoCP 91-555 for M. sacchari and L 97-128 > LCP 85-384 > HoCP 91-555 for S. flava. Therefore, antibiosis is an important category of resistance in sugarcane to both aphid species, and HoCP 91-555 might provide useful germplasm for developing aphid resistant cultivars.
  Journal of Economic Entomology 08/2010; 103(4):1431-7. · 1.70 Impact Factor
• Source

  Available from: fcla.edu

  Article: Elachista saccharella (Lepidoptera: Elachistidae), a Leafminer Infesting Sugarcane in Louisiana

  W. H. White, T. E. Reagan, C. Carlton, W. Akbar, J. M. Beuzelin
  Florida Entomologist 09/2009; · 1.36 Impact Factor
• Source

  Available from: usda.gov

  Article: Sugarcane borer (Lepidoptera: Crambidae) management threshold assessment on four sugarcane cultivars.

  F R Posey, W H White, F P F Reay-Jones, K Gravois, M E Salassi, B R Leonard, T E Reagan
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  ABSTRACT: This research assesses the potential for using different economic injury thresholds in management of a key insect pest on susceptible and resistant commercially produced cultivars of sugarcane (Saccharum spp. hybrids). In a 2-yr sugarcane borer, Diatraea saccharalis (F.) (Lepidoptera: Crambidae), study involving four commercially produced sugarcane cultivars and four insecticide treatment thresholds, 'LCP 85-384' and 'HoCP 91-555' were the most susceptible based on percentage of bored internodes compared with the more resistant 'HoCP 85-845' and 'CP 70-321'. In 2001, the 10% infested stalks threshold was not as effective as the 5% early season-10% late season and 5% full season for HoCP 91-555. Based on D. saccharalis injury under natural infestation conditions, susceptible cultivars seem to require a lower infestation threshold than the more resistant cultivars to achieve adequate injury reduction. Among yield components, only the theoretical recoverable sugar per stalk was significantly increased by applying insecticides. With the resistant HoCP 85-845, differences were not detected for percentage of bored internodes among treated versus untreated management regimes. The resistant HoCP 85-845 had higher levels of fiber in our study; however, no clear pattern on resistance mechanisms was established, because the resistant cultivar CP 70-321 had comparatively low levels of fiber. The development of cultivar-specific thresholds is expected to lower the amount of insecticide used for D. saccharalis management in the sugarcane industry, reduce selection pressure, and delay the development of insecticide resistance.
  Journal of Economic Entomology 07/2006; 99(3):966-71. · 1.70 Impact Factor
• Source

  Available from: ufl.edu

  Article: Melanaphis sacchari (Homoptera: Aphididae), a sugarcane pest new to Louisiana.

  W.H. White, T E Reagan, D.G. Hall
• Article: Elachista saccharella (Lepidoptera: Elachistidae), a leafminer infesting sugarcane in Louisiana.

  W.H. White, T E Reagan, C. Carlton, W Akbar, J M Beuzelin