Movement of Mexican rice borer (Lepidoptera: Crambidae) through the Texas rice belt.
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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ABSTRACT: The leafminer Cameraria ohridella Deschka & Dimicis an invasive pest of horse chestnut, Aesculus hippocastanum L., trees that has spread rapidly across Europe over the past 19 yr. It was recently reported in the United Kingdom, Denmark, and the Ukraine, and this spread is expected to continue through the Scandinavian countries until the northern limit of the host tree distribution is reached. The presence of the species is generally reported Þrst in the cities, either as consequence of human-related transportation or because of the higher number of host trees in these areas. As a consequence, detailed studies of the spread of this pest through rural areas have not yet been carried out. We have monitored the spread of the moth at the fringe of its known distribution in eastern France during the period 2001Ð2003. The population was estimated by observing the damage caused by the pest and by establishing a network of pheromone traps. Pheromone traps were set up to measure two generations in 2001 and 2002, whereas the spatial pattern of the spread of the species measured by damage assessment was followed for each generation between 2001 and 2003 (nine generations). Spatial and temporal patterns in the population estimates made using these two methods were compared. We found that estimates made from damage assessment correlated with log-transformed estimates from pheromone trap catches, suggesting that both techniques can be used to monitor the spread of this pest. Over the period 2001Ð2003, the spread rate ranged from 17.0 to 37.9 km/yr, depending on the population threshold and method used.Environmental Entomology, v.33, 1584-1592 (2004). 01/2004;
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ABSTRACT: Eoreuma loftini (Dyar) adults were observed in the laboratory to study their behavior before and during the mating process. Characteristic female calling behavior and male response to females and crude sex pheromone extracts made from excised ovipositors were noted. Bioassays were performed on ovipositor extracts, and levels of male activity at various hours after darkness were determined. Males began responding to extracts of ovipositors at darkness, and activity peaked between 5 and 9 h after darkness. Males exposed to 0.5-1.0 female equivalents of extract exhibited responses indistinguishable from those to calling females. In the presence of pheromone extracts, males often attempted to mate with other males, the nylon mesh covering, and the filter-paper square used to dispense the pheromone.Journal of Economic Entomology 01/1988; 81(1):184-188. · 1.60 Impact Factor
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ABSTRACT: Eoreuma loftini (Oyar) was intercepted from Mexico regularly at ports of entry in the Lower Rio Grande Valley of Texas (LRGV) about 10 years before its identification in LRGV plant hosts. E. loftini appears to have migrated from western Mexico to eastern Mexico before entering Texas. Interceptions were primarily from sugarcane during late fall and winter months when sugarcane is highest in sugar content. Corn, sorghum, and wild grasses were other intercepted hosts. Two other Pyralid sugarcane pests in Mexico, Diatraea considerata Heinrich and D. magnifactella Oyar, appear to be following a similar pattern. Both have been intercepted at LRGV ports of entry since 1980. Sites of origin of intercepted hosts suggest that both species have had the opportunity to establish in northern Tamaulipas, Mexico, bordering the LRGV. Intercepted host plants and seasonal interception patterns are similar to those of E loftini. Research on these species in Mexico is suggested.Bulletin of the ESA. 12/1983; 30(3):47-52.