Biology of Sitotroga cerealella (Oliv.) (Lepidoptera: Gelechiidae) reared on five corn (maize) genotypes
Department of Zoology, Institute of Biology, UNICAMP, 13084-100 Campinas, Sao Paulo, Brazil Journal of Stored Products Research
(Impact Factor: 1.68).
04/1995; 31(2):139-143. DOI: 10.1016/0022-474X(94)00044-T
Laboratory experiments under controlled conditions of 30 ± 1 °C, 60 ± 10% r.h. and 14 h photophase were performed to study the biology of Sitotroga cerealella (Oliv.) reared on five natural diets of different corn (maize) genotypes. S. cerealella reared on the shrunken2 genotype displayed the longest developmental time (43.5 d) and the lowest fecundity (85.2 eggs/female). Although the egg to adult developmental time (40.2 d) of S. cerealella reared on sugary-opaco2 did not differ significantly from those on normal, opaco2 and sugary, the survival of the pre-imaginal stage (42.2%) was significantly reduced on this genotype. Significant differences were not found between the number of eggs hatched from females reared on these genotypes. The egg hatch ranged from 86.8 to 95.3% for the shrunken2 and opaco2 genotypes, respectively. Further rearing studies to determine the effects of these genotypes on the biology of S. cerealella are needed, since significant differences were not observed in the data from two successive generations.
Available from: Lêda R A Faroni
- "The Angoumois Grain Moth, Sitotroga cerealella Olivier (Lepidoptera: Gelechiidae), has been considered a major pest of stored agricultural products worldwide. The larvae of S. cerealella attack both in field or/and in storeroom a variety of kernels, including corn (Cônsoli and Filho 1995; Weston and Rattlingourd 1999; Ahmed and Raza 2010). The preference of insects for a plant or specific plant parts results from different compounds produced by plants (Bernays and Chapman 1994). "
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ABSTRACT: The flight behavioral responses of males and females of Sitotroga cerealella (Lepidoptera: Gelechiidae) to corn kernel volatiles, in a wind tunnel, and the determination and identification of the active compounds of corn kernel volatiles were investigated. A wind tunnel bioassay was carried out to test the response of males and females to 15, 30, 60, and 120 g equivalents of corn kernel volatiles. Gas chromatography-electroantennography was used to determine which components in corn kernel volatiles elicited an EAD response using male and female antennae. Gas chromatography-mass spectrometry technique was used to identify the active compounds of corn kernel volatiles. A 60-g equivalent of corn kernel volatiles elicited attractant behavior of unmated males to landing near the source. Mated males and virgin females were not attracted to corn kernel volatiles. The number of mated females landing was significantly higher in 60- and 120-g equivalents of corn kernel volatiles, compared to the other concentrations and the control. The antennae of males and females responded to four active compounds of corn kernel volatiles. Three of these compounds were identified, namely nonanal, decanal, and geranyl acetone. It is suggested that host finding and selection by S. cerealella is associated with its host volatiles.
Arthropod-Plant Interactions 12/2013; 7(6). DOI:10.1007/s11829-013-9275-y · 1.46 Impact Factor
Available from: David K Weaver
- "(Yadav et al., 2003), but fecundity tended to be higher (137e165), with the exception of only 85 eggs laid on one genotype, on different genotypes of corn stored at 27 C and 50% r.h. (Consoli and Amaral- Filho, 1995). Shazali and Smith (1985) also reported higher fecundity on sorghum stored at 20e30 C, with 119e136, 131e165, and 144e178 eggs laid at 40%, 60, and 80% r.h., respectively, and 80e121 eggs laid at 35 C at these same relative humidities. "
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ABSTRACT: a b s t r a c t The Angoumois grain moth, Sitotroga cerealella (Olivier) (Lepidoptera: Gelechiidae), is a pest of stored corn, Zea mays L., and other grains throughout the world. Sitotroga cerealella are routinely exposed to temperatures below 20 C in regions of the U.S. where corn is grown, yet there are no data describing adult life history parameters below 20 C. We determined longevity, fecundity, and survivorship of eggs at a range of temperatures that represent environmental conditions to which S. cerealella are exposed in corn stored in the U.S.
Journal of Stored Products Research 10/2013; 55(2013):128-133. DOI:10.1016/j.jspr.2013.10.003 · 1.68 Impact Factor
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ABSTRACT: Life table studies for the Angoumois grain moth, Sitotroga cerealella (Olivier), a pest on stored maize, Zea mays L., in West Africa, were conducted as part of the expansion of a mathematical simulation model that has been developed for two pests of stored maize. The effects of four temperatures (20, 25, 30, and 35 degrees C) and two relative humidity levels (44 and 80%) on developmental time, age-specific survivorship and fecundity, sex ratio, and intrinsic rate of natural increase (r(m)) of S. cerealella were investigated. Sex ratio was close to 1:1 at all temperatures and humidity. Minimum development time occurred close to 32 degrees C and 80% RH for both males and females, and developmental time of females was significantly shorter than that of males. Immature survivorship was highest between 25 and 30 degrees C and 80% RH and lowest at 35 degrees C under both humidity conditions. A similar low level was found at 20 degrees C and 44% RH. The greatest fecundity (124 eggs per female) occurred at 20 degrees C, 80% RH. The maximum r(m) value was 0.086 d(-1) at 30 degrees C and 80% RH, but the growth rate declined dramatically at 35 degrees C. If compared with the few other life table studies conducted on this species on maize in India and North America, some variation among the strains becomes evident. A common conclusion for the current study and previous ones is that optimal population development for S. cerealella occurs at approximately 30 degrees C and at high humidity.
Journal of Economic Entomology 09/2004; 97(4):1484-90. DOI:10.1603/0022-0493-97.4.1484 · 1.51 Impact Factor
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