Location: Subtropical Horticulture Research
2010 Annual Report
Field tests of mass trapping and bait stations for Caribfly population suppression. The second year of an ongoing study tested a new version of the caribfly bait station that had an improved visual cue and an increased attractant release rate. The greatest suppression of adult fly numbers was obtained in the mass trapping treatment, and fruit from that block had the lowest level of larval infestation. The block with the improved bait station also had fewer adults trapped than the untreated control, but larval infestation was not reduced.
Response of sterile male medflies to rasped bark from several host and non-host trees. Studies were initiated to test response of male medflies to chemicals from bark rasped from avocado trees that contain chemicals reported to have a strong behavioral effect. Sterile males were used for these studies. Response to bark from four avocado genotypes was compared with response to bark from two trees reported to show high level and low level short-range attraction for males. Response to the four avocado varieties was intermediate, and correlated with EAG response to the six types of bark. Chemical analysis is ongoing to identify semiochemicals responsible for medfly response.
Behavior of male medflies in response to exposure to plant essential oils. Studies were initiated to test response of male medflies to plant essential oils. Response to previously untested essential oils, including essential oils used in traps for the redbay ambrosia beetle, was compared with response to essential oils previously reported to have strong behavioral effects on males. Short-range attraction bioassays using sterile males were used to determine optimal dose for each oil. Long-range attraction was tested with flight cage tests using sterile males, using different trap and lure dose combinations. Parallel field tests were conducted in Honduras under an SCA to test response of wild medflies. Chemical analysis is ongoing to identify semiochemicals responsible for medfly response.
Field evaluation of two lures and two trap types for capture of redbay ambrosia beetle. Forest entomologists identified manuka oil and phoebe oil as baits for monitoring the redbay ambrosia beetle (RAB). Our initial field tests suggested that phoebe oil was more attractive than manuka oil and research has been initiated to evaluate efficacy.
Heath, R.R., Vazquez, A., Schnell, E.Q., Kendra, P.E., Epsky, N.D. 2009. Dynamics of pH modification of an acidic protein bait used for tropical fruit flies (Diptera: Tephritidae). J. of Econ. Entomol. 102(6):2371-2376.
Amarasekare, K., Mannion, C.M., Epsky, N.D. 2009. Efficiency and establishment of three introduced parasitoids of the mealybug Paracoccus marginatus (Hemiptera: Pseudococcidae). Biological Control. 51:91-95.
Kendra, P.E., Epsky, N.D., Heath, R.R. 2010. Effective sampling range of food-based attractants for female Anastrepha suspensa (Diptera: Tephritidae). Journal of Economic Entomology. 103(2):533-540.
Kendra, P.E., Montgomery, W.S., Epsky, N.D., Heath, R.R. 2009. Electroantennogram and behavioral responses of Anastrepha suspensa (Diptera: Tephritidae) to putrescine and ammonium bicarbonate lures. Environmental Entomology. 38(4): 1259-1266.