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Identification and diel activity patterns of predators attacking Helicoverpa zea (Lepidoptera: Noctuidae) eggs in soybean and sweet corn


, : Identification and diel activity patterns of predators attacking Helicoverpa zea (Lepidoptera: Noctuidae) eggs in soybean and sweet corn. Environmental Entomology 31(2): 232-241

Predation on lepidopteran eggs in soybean and corn and the temporal partitioning of predation among the predator species were examined in soybean Glycine max (L.) and sweet corn Zea mays (L.). The complex of predators feeding on lepidopteran eggs [Helicoverpa zea (Boddie)] and the key predators discovered in this study were different in each crop. The dominant predator in each crop was consistent from year to year but the secondary predators varied in importance. Nabids were the dominant predator group in soybean contributing 51 and 50% of the observed predation events in 1993 and 1994, respectively. The coccinellid, Coleomegilla maculata (DeGeer), was the dominant predator in corn contributing 43.9 and 46.3% of the observed predation events in 1993 and 1994, respectively. Other predators causing >=10% of the observed predation events included Geocoris punctipes Say and the Phalangiidae in soybean, and the nabids, Orius insidiosus Say and Lygus lineolaris (Palisot de Beauvois) in sweet corn. All predators observed feeding exhibited taxa specific diel patterns of predation C. maculata, O. insidiosus and G. punctipes were primarily day active, with 75, 85.7, and 100% of observed predation events occurring during daylight hours, respectively. Nabids were primarily nocturnal with 84.2% of predation events happening at night. Phalangiids, Clubiona abbotii Koch, Lygus lineolaris, and the elaterids were only observed preying upon H. zea eggs nocturnally. Because the dominant predators and their diel activity varied between crops, the period of peak egg predation did also. Egg predation was usually higher during the day in corn and at night in soybean. Crop, date, and time of day all affected intensity of predation on H. zea eggs. Predation in both crops increased through the beginning of August and then declined on the last sampling date. Predation was usually higher in corn than in soybean (three of four sample dates). However, when anthesis was occurring in corn plots, predation rates in soybean and corn were similar. Apparently the availability of sweet corn pollen as an alternative food source for C. maculata caused a reduction in egg predation.

US$19.90

DOI: 10.1603/0046-225x-31.2.232


Other references

Ieshko, E.P.; Golitsina, N.B., 1984: Analysis of the spatial structure of a population of Bunodera luciopercae from Perca fluviatilis. The age and seasonal dynamics of B. luciopercae were studied in P. fluviatilis from Lake Syamozero, Karelia, USSR, from June 1981 to July 1982. The fish were categorized as Groups I, II and III for fish measuring <less or =>7.1, 7.2 to 11.3...

Enderby, G.E., 1944: Use and Abuse of Trichlorethylene. British Medical Journal 2(4365): 300-302

P.K.rchner; Jutta Schaper, 1986: Use of microwave energy for myocardial tissue fixation in electron microscopy. Journal of Molecular and Cellular Cardiology 18(supp-S2): 29-29

Boda, D.; Gál, G.; Eck, E.; Kiss, E., 1977: Ultraviolet spectrophotomerty studies of serum dialysate from patients with long term intermittent artificial kidney treatment. In 16 chronically dialysed uraemic patients in the course of altogether 61 treatments with the artificial kidney the UV-absorption spectre of the in-vitro-dialysate of the serum was studied. In uraemia on account of the retention of the metabolic...

Mancuso, J.E.; Abramow, S.P.; Dimichino, B.R.; Landsman, M.J., 1991: Carbon dioxide laser management of plantar verruca: a 6-year follow-up survey. Patients receiving treatment for plantar verruca by carbon dioxide laser vaporization from 1984 through 1989 were surveyed with follow-up from 3 months to 6 years. Materials and methods, operative technique, and results were reviewed. This procedu...

Robati, R.M.; Dadkhahfar, S.; Rakhshan, A., 2017: CD34 negative superficial acral fibromyxoma: A rare case report. Superficial acral fibromyxoma (SAF) is a slow growing soft tissue tumor that mainly appears in the acral areas. Here, we report a case of a SAF with distinctive immunophenotype charachteristics. An 18-year-old female was referred to our clinic wit...

Negrete, R.J.; Schick, E.A.; Cooper, J.P., 2007: Lower-limb dominance as a possible etiologic factor in noncontact anterior cruciate ligament tears. The purpose of this study was to determine if lower-limb dominance is a potential etiologic factor in noncontact anterior cruciate ligament (ACL) tears. A multicenter retrospective case analysis was performed. In each of the participating centers,...

Rahman, I.; MacNee, W., 2002: Oxidative stress and adaptive response of glutathione in bronchial epithelial cells. Clinical and Experimental Allergy 32(4): 486-488

Brady, L., 2009: Prompted voiding yields results. CNAs are key to the success of a pilot study that reduced urinary incontinence for residents of one Illinois facility. Provider 35(3): 41-44

Cioni, F., 1992: Weed control in sugarbeet: 1991 experimental results. Mixtures of herbicides at reduced rates and volumes were applied pre- and post-em. to sugarbeet grown at 5 sites on soils ranging from sandy to clay. At 4 sites Veronica spp. constituted 27.7%, grasses 21.8% and Sorghum halepense 8.5% of the weed...