Article

Movement of Mexican Rice Borer (Lepidoptera: Crambidae) Through the Texas Rice Belt

Texas A&M University Agricultural Research and Extension Center, Beaumont, TX 77713, USA.
Journal of Economic Entomology (Impact Factor: 1.61). 03/2007; 100(1):54-60. DOI: 10.1603/0022-0493(2007)100[54:MOMRBL]2.0.CO;2
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ABSTRACT Pheromone-baited traps were used to monitor the movement of the Mexican rice borer, Eoreuma loftini (Dyar) (Lepidoptera: Crambidae), through the Texas rice belt from 2000 to 2005. Based on location of discovery in each county and year, the average rate of spread from 1980 to 2005 was 23 km/yr. From 2000 to 2005, the leading edge of the infestation has moved 16.5 km/yr toward Louisiana. The 1.8-fold increase (99% confidence interval) of the area occupied from 2000 to 2005 in the Texas rice belt indicates an expansion of the distribution of E. loftini. If movement continues to occur at similar rates, E. loftini will reach Louisiana by 2008.

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    • "hybrids, in south Texas since spreading there in 1980 (Johnson and Van Leerdam, 1981) where it represents >95% of the stalk borer population (Legaspi et al., 1999a). The pest's distribution has extended into the rice, Oryza sativa L., production region of east Texas (Browning et al., 1989; Reay-Jones et al., 2007b), presumably assisted by >15 species of North American alternate host plants (Van Zwaluwenberg, 1926; Osborn and Phillips, 1946; Johnson, 1984; Browning and Hussey, 1987) including other economically important crops such as corn, Zea mays L., sorghum, Sorghum bicolor L. Moench, and rice (Van Zwaluwenberg, 1926; Osborn and Phillips, 1946; Youm et al., 1988; Rodriguez-del-Bosque et al., 1996). "
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    ABSTRACT: Two sugarcane, Saccharum hybrids, varieties were grown in the greenhouse under well watered or drought conditions to examine the influences of stress on Mexican rice borer, Eoreuma loftini (Dyar), oviposition preference and selected nutritional components without impinging factors common to field conditions that alter responses. Our research revealed that, under controlled conditions, drought induced a wider range and greater uniformity of free amino acid (FAA) accumulations than have been previously reported. Drought stress resulted in increased dry leaf tissue and elevated concentrations of 7 of 9 detectable free essential (for insect health) amino acids in stalks, the chief food of Mexican rice borer larvae. Stressed sugarcane was preferred for oviposition, likely related to greater numbers of dry leaves and heightened host plant nutritional quality. Dry leaf tissue, which is not consumed, may be a cue for improving chances of larvae encountering nutrient-enhanced living tissue, and for concealing eggs in folds. Excised dry leaf tissue from the treatments was indistinguishable for oviposition preference; therefore, biochemical status of living tissue may provide oviposition cues. Varieties exhibited no major genotypic differences in FAA accumulations or oviposition preference.
    Crop Protection 05/2010; 29(5). DOI:10.1016/j.cropro.2009.07.014 · 1.49 Impact Factor
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    • "By 1989, it moved into the rice production area of east Texas (Browning et al. 1989), where it is responsible for major yield loss in rice (Reay-Jones et al. 2005b). Invasion of Western Louisiana, where sugarcane and rice are grown in close proximity, is likely imminent (Reay-Jones et al. 2007). The objectives of this study were (1) to quantify E. loftini oviposition on sugarcane and rice cultivars at different phenological stages, (2) to identify selected potential biochemical mechanisms behind these relationships, and (3) to estimate oviposition patterns on sugarcane and rice in Texas and projected patterns in Louisiana. "
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    ABSTRACT: Oviposition preference studies of the Mexican rice borer, Eoreuma loftini (Dyar), on sugarcane, Saccharum spp., and rice, Oryza sativa L., showed that drought stressed sugarcane was 1.8-fold more attractive based on egg masses/plant than well watered sugarcane. The E. loftini susceptible sugarcane cultivar LCP 85-384 was 1.6-fold more attractive than HoCP 85-845 based on numbers of eggs per egg mass. Egg masses were 9.2-fold more abundant and 2.3-fold larger on sugarcane than on rice. Rice, however, was preferred to sugarcane on a plant biomass basis. Oviposition on sugarcane occurred exclusively on dry leaf material, which increased under drought stress. Egg masses per plant increased on drought stressed sugarcane and were correlated with several foliar free amino acids essential for insect growth and development. The more resistant (based on injury) but more attractive (based on oviposition) rice cultivar XL8 had higher levels of several free amino acids than the susceptible cultivar Cocodrie. The association of host plant characteristics to oviposition preference is discussed. Projected oviposition patterns relative to sugarcane and rice production areas were estimated for Texas and Louisiana based on the availability of each host in different regions of each state. These results suggest that, where sugarcane and rice co-occur, the majority of eggs would be found on sugarcane early in the season, because of this crop's substantially greater biomass compared with rice. Abundance later in the season would also favor sugarcane; however, the abundance on rice would be greater than expected solely based on host availability, largely because of the greater preference per gram of rice plant dry weight.
    Environmental Entomology 09/2007; 36(4):938-51. DOI:10.1603/0046-225X(2007)36[938:ROOPIA]2.0.CO;2 · 1.42 Impact Factor
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