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Identification of Cotton Fleahopper (Hemiptera: Miridae) Host Plants In

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Identification of Cotton Fleahopper (Hemiptera: Miridae) Host Plants In PLANTÐINSECT INTERACTIONS Identification of Cotton Fleahopper (Hemiptera: Miridae) Host Plants in Central Texas and Compendium of Reported Hosts in the United States 1 J. F. ESQUIVEL AND S. V. ESQUIVEL USDAÐARS, SPARC, Areawide Pest Management Research Unit, 2771 F&B Rd., College Station, TX 77845 Environ. Entomol. 38(3): 766Ð780 (2009) ABSTRACT The cotton ßeahopper, Pseudatomoscelis seriatus (Reuter), is an early-season pest of developing cotton in Central Texas and other regions of the Cotton Belt. Cotton ßeahopper popu- lations develop on spring weed hosts and move to cotton as weed hosts senesce or if other weed hosts are not readily available. To identify weed hosts that were seasonably available for the cotton ßeahopper in Central Texas, blooming weed species were sampled during early-season (17 MarchÐ31 May), mid-season (1 JuneÐ14 August), late-season (15 AugustÐ30 November), and overwintering (1 DecemberÐ16 March) periods. The leading hosts for cotton ßeahopper adults and nymphs were evening primrose (Oenothera speciosa T. Nuttall) and Mexican hat [Ratibida columnifera (T. Nuttall) E. Wooton and P. Standley], respectively, during the early season. During the mid-season, silver-leaf nightshade (Solanum elaeagnifolium A. Cavanilles) was consistently a host for ßeahopper nymphs and adults. Woolly croton (Croton capitatus A. Michaux) was a leading host during the late season. Cotton ßeahoppers were not collected during the overwintering period. Other suitable hosts were available before previously reported leading hosts became available. Eight previously unreported weed species were documented as temporary hosts. A compendium of reported hosts, which includes Ͼ160 plant species representing 35 families, for the cotton ßeahopper is provided for future research addressing insectÐhost plant associations. Leading plant families were Asteraceae, Lamiaceae, and Onagraceae. Results presented here indicate a strong argument for assessing weed species diversity and abundance for the control of the cotton ßeahopper in the Cotton Belt. KEY WORDS cotton ßeahopper, host plant, cotton pest The cotton ßeahopper [Pseudatomoscelis seriatus (Re- and pest-speciÞc insecticides for lepidopteran control uter); Hemiptera: Miridae] was Þrst reported in Texas (Armstrong and Camelo 2003, Layton et al. 2003). The cotton (Gossypium hirsutum C. Linnaeus) by Howard aforementioned components have all been incorpo- (1898). The ßeahopper is an early-season pest that rated in the cotton-producing areas of the Southern uses piercing-sucking mouthparts to feed on develop- Blacklands region of Central Texas. Furthermore, the ing cotton fruit (i.e., squares). The affected squares Southern Blacklands region is in the advanced stages are shed by the cotton plant, resulting in yield losses. of boll weevil eradication efforts, and cotton ßeahop- Fleahopper adults typically move from senescing pers could potentially become a post-eradication pest weed hosts to infest cotton (Reinhard 1926a, Almand in Central Texas as well. Host plant data will be in- 1974). Adults have been shown to leave weed hosts strumental in determining sources of cotton ßeahop- and migrate to adjacent cotton (Suh et al. 2004), or in per populations that subsequently infest cotton. some cases, have infested cotton 20 miles from the Historically, plant species in the Croton, Oenothera, original weed host (Gaines and Ewing 1938). Monarda, and Solanum genera have been identiÞed as Sucking insects, including the cotton ßeahopper, leading hosts for the cotton ßeahopper during the have gained importance as pests of cotton in recent overwintering, early-season, summer, and fall seasons, years. Reports attribute this elevated status to the respectively. Previous reports deÞned the leading adoption of transgenic cotton varieties, absence of hosts for the ßeahopper as members of the mentioned traditional early-season insecticide sprays to control genera but the composition of plant species within boll weevils (Anthonomus grandis grandis Boheman), these genera has varied among studies, likely because of differences in plant composition among geograph- ical locations. Furthermore, some of these reports This article reports the results of research only. Mention of a (Gaines and Ewing 1938, Fletcher 1940, Almand 1974, proprietary product does not constitute an endorsement or a recom- mendation by the USDA for its use. Idol and Slosser 2005) focused speciÞcally on selected 1 Corresponding author, e-mail: [email protected]. primary hosts with little regard for other hosts that June 2009 ESQUIVEL AND ESQUIVEL:HOSTS OF THE COTTON FLEAHOPPER 767 may have contributed to the developing ßeahopper ovipositor or male genitalia. Voucher specimens of populations. Reported hosts are further confounded wild host plant species were collected and sent to the by laboratory feeding (Gaylor and Sterling 1976a, b; S.M. Tracy Herbarium at Texas A&M University, Col- Beerwinkle and Marshall 1999) and oviposition stud- lege Station, TX, for identiÞcation and cataloging. ies (Holtzer and Sterling 1980) or all-encompassing To determine the presence of cotton ßeahoppers in statements listing hosts without providing sampling associated temporal host plant species, sampling con- data. For example, Brett (1946) and Hixson (1941) tinued throughout the year beginning on 17 March alluded to the breadth of cotton ßeahopper host plants 2003. Temporal occurrence of plant species was cat- but failed to provide sampling data. Similarly, Eddy egorized into early season (17 MarchÐ31 May), mid- (1927) stated that “other succulent plants” were also season (1 JuneÐ14 August), late season (15 AugustÐ30 hosts. Finally, Fletcher (1930) discussed cyclic November), and overwintering (1 DecemberÐ16 changes in vegetation and their effects on the insect March). These categories coincided with local farm- fauna in Central Texas. Because of this latter point, the ing and production practices. Host plants were pre- prevalence of anecdotal records of host plants, and the sumed to be and deÞned as those species where cotton absence of a current taxonomically accurate database ßeahopper adults and/or nymphs were present. Be- of cotton ßeahopper host plants, the objectives of this cause nymphs do not have wings to move from host to study were to identify temporally available weed spe- host, weed species yielding nymphs were considered cies harboring cotton ßeahoppers in the southern likely reproductive hosts. In total, 76 sites of weed Blackland Prairies of Central Texas and provide a species and six sites of cultivated species (Glycine max deÞnitive and current listing of host plants associated and Medicago sativa) were sampled during the 3-yr with the cotton ßeahopper. study. Although some weed species were only sam- pled 1 yr because of the variable yearly occurrence or abundance, these data were included to show the Materials and Methods range of plant utilization by cotton ßeahoppers in the Between 17 March 2003 and 17 March 2006, bloom- region. ing herbaceous weeds, alfalfa (Medicago sativa C. Lin- Because of taxonomic revisions of previously re- naeus), and soybeans [Glycine max (C. Linnaeus) E. ported plants and their respective authorities, the Merrill] were sampled for cotton ßeahoppers in Bur- compendium of cotton ßeahopper host plants pre- leson and Robertson counties (Central Texas). As sented here was formulated from a literature review blooming weed species were identiÞed along right- beginning with Howard (1898) through 2008. Refer- of-ways, turn-rows, and ditches, these species were eed journal articles, proceedings, Federal and State subject to sampling. Gaylor (1975) previously con- Agency bulletins, and theses and dissertations with cluded that plant species were more suitable hosts for speciÞc reference to cotton ßeahopper and host plant cotton ßeahoppers when ßowering. Pneumatic air associations were reviewed. Sterling and Dean (1977) samplers and beat sheets were evaluated in prelimi- were consulted for earlier reports of host plant asso- nary studies on row crops, but these tools were not ciations. The botanical nomenclature presented fol- conducive to efÞcient sampling in weed hosts. Be- lows that of Jones et al. (1997). Some previous reports cause of inconsistent plant densities and variable plant only provided common names of host plants. Where architectures in weed species, sweep nets (38.1 cm this occurred, the host plants were assigned to genera diameter) were used for sampling weed hosts. For only (e.g., ragweed ϭ Ambrosia spp.; horsemint ϭ similar reasons, the sweep net was used in previous Monarda spp.) for inclusion in this report. Where host host plant studies (Cleveland 1982, Anderson and species occurred outside of Texas, online searches Schuster 1983, Womack and Schuster 1987, Armstrong were conducted using http://plants.usda.gov/index. and Camelo 2003). Unlike some previous host plant html to locate current taxonomic designations. studies that used variable sample sizes within each The PROC MEANS statement (SAS Institute 2004) study (Cleveland 1982, Snodgrass et al. 1984, Fleischer and the SUM and BY options were used to generate and Gaylor 1987), a uniform protocol of three samples descriptive statistics of the number of cotton ßeahop- (50 sweeps/sample) for each sample site was imple- per adults and nymphs in temporal host plants sam- mented in this study. Because of this sampling proto- pled during this study. Similarly, the mean proportions col, plant species that were in bloom but not in suf- of adults
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