Geocoris pallens and G. punctipes were assayed in and collected from Lytle Preserve in the Great Basin Desert of southwestern Utah, USA (latitude To the Graduate Council: I am submitting herewith a thesis written by Nicole D. Pendleton entitled “Development and Impact of. Geocoris punctipes (Say). Preferred Scientific Name; Geocoris punctipes. Taxonomic Tree; Domain: Eukaryota; Kingdom: Metazoa; Phylum: Arthropoda; Subphylum: Uniramia; Class .
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The bigeyed bugs, Geocoris spp. They are generally regarded as beneficial because they prey upon numerous kinds of insect and mite pests of turf, ornamental and agricultural crops. Bigeyed bugs are among those insects receiving research attention in Florida and elsewhere for their value as predators. To aid in identification of bigeyed bugs in Florida, a key to adults and late instar nymphs is provided in this publication.
Adult bigeyed bug, Geocoris sp. Geocoris uliginosus Say geocoriw over most of the United States and southern Canada.
In Florida, Punctpies uliginosus is known at least as far south as Ft. Adult Geocoris uliginosus Saya bigeyed bug. Photograph by Lyle J. BussUniversity of Florida.
Geocoris punctipes Puntcipes is primarily an Austroriparian species, common throughout Florida, and ranging from New Jersey west to southern Indiana and Colorado south and southwest to Texas, Arizona, California and Mexico. Other localities include Guatemala, Panama and Hawaii.
Adult Geocoris punctipes Saya bigeyed bug.
Geocoris bullatus Saythe large bigeyed bug, is widely distributed in the United States and Canada, from coast to coast. There are beocoris Florida records from the northern border south to Key West.
Adult Geocoris bullatus Saythe large bigeyed bug. Bigeyed bugs are small, oblong-oval lygaeids with a head that is broader than it is long, and prominent eyes that curve backward and overlap the front of the pronotum.
The stylus has a longitudinal groove. These features can be seen on nymphs as well as adults and serve egocoris separate bigeyed bugs from similar bugs. A distinguishing feature of adult bigeyed bugs is the very short or absent claval commissure. Lygaeids such as chinch bugsBlissus spp. Also, the head has more of a triangular shape in these lygaeids. Caplan emphasized the need for turf specialists to distinguish between bigeyed bugs and chinch bugs.
Misidentification could result in a chinch bug spray directed against geocorines, resulting in needless loss of money and beneficial insects. A comparison of the claval commissure on a bigeyed bug, Geocoris sp. Adult left and nymph right chinch bugs, Blissus sp. Adult left and nymph right false chinch bugs, Nysius raphanus Howard.
Adult pamera bug, Neopamera sp. The following key to geocorines in Florida does not include two species of Hypogeocoriswhich have been reported in Florida, but apparently are scarce or rare.
Some minor variations in Geocoris bullatus Say and Geocoris uliginosus Say have geoocoris formalized as subspecies, but will not be considered here. Beak with segment I basal longer than II; head except in Geocoris punctipes punctulate with small pits or punctippes minutely wrinkled.
Beak with segment I subequal to or shorter than II; head smooth, impunctate, shining. Nearly all black above except for pale border along each side; scutellum entirely black Fig. Geocoris uliginosus Say 2′. Mostly pale above; scutellum with a pair of pale areas or spots Fig. Scutellum with a pair of prominent, smooth impunctatecalloused basolateral, pale spots, the spots sometimes extending posteriorly extension punctulate ; pronotum with a pair of somewhat lunate impunctate callosities, usually shiny black but sometimes invaded by various amounts of yellow; head smooth, polished, not at all granulose; inner posterior margin of corium not marked with fuscous or at most weakly so; groove of tylus extending back onto vertex and crossed near middle by an arcuate, transverse sulcus Fig.
Geocoris punctipes Say Scutellum with a pair of punctate, non-calloused, submedial, pale-yellow areas; the shape and extent of pale areas variable but usually oblong and partially angulate; pronotum with the pair of impunctate callosities nearly round, pale-yellow; head granulose; inner posterior margin of corium marked with two fuscous “spots”, the posterior one larger; grocoris of tylus not extending back onto vertex; vertex lacking transverse sulcus; length 3.
Geocoris bullatus Saythe large bigeyed bug. To key a lygaeid nymph to genus, consult Sweet and Slater Dorsal ground color of head and thorax dark brown Fig. Geocoris uliginosus Say 1′. Dorsal ground color of head and thorax pale irregular dark spots often present. Nymph of Geocoris uliginosus Saya bigeyed bug.
Mesothoracic wing pads developing forewings either unmarked or with only one apical brown spot; scutellum with two pairs of linear brown marks, sometimes coalesced into one large pair, these marks basolateral; pronotum usually with three pairs of brown spots, variable in shape and degree of pigmentation, often inconspicuous; antennal segments I through III each with prominent dorsoapical pale spot Fig. Nymph of the large bigeyed bug, Geocoris bullatus Say. Photograph by Ronald Smith, Auburn University; bugwood.
Mesothoracic wing pads each with four or five brown marks usually three basal streaks, one middle dot, and one prominent apical spot ; scutellum with three to five pairs of dark brown marks usually four pairsthe most prominent pair near middle; pronotum with five to six pairs of conspicuous dark brown irregular spots; antennal segments I to III each without dorsoapical pale spot Fig.
Nymph of Geocoris punctipes Saya bigeyed bug. The literature on the food habits and life histories of Geocoris spp.
The most abundant bigeyed bug in Florida and the southeastern United States is Geocoris punctipes Say. McGregor and McDonough reported the life history of Geocoris punctipes at Batesburg, South Carolina, finding the average development time from egg to adult was 30 days.
York reported that adult Geocoris required either free moisture or plant moisture as well as insect prey. Sweet found that Geocoris adults can survive on sunflower seeds and water, without insect food. Stoner found that Geocoris punctipes apparently needed prey for proper development and fecundity. Eggs of Geocoris bullatus Saythe large bigeyed bug. Photograph by Ronald Smith, Auburn University; www.
Whitcomb and Bell reported that bigeyed bugs preyed upon aphids, plant bugs, eggs, and young larvae of the bollworm and cotton leafworm in Arkansas cotton fields. On the negative side, however, the prey occasionally were beneficial species Orius spp.
Champlain and Sholdt reported on the life history of Geocoris punctipes in the laboratory. Nymphs consumed an average of 47 mites, and adults an average of 83 red spider mites on cotton per day. Tamaki and Weeks listed 46 references, itemized from the literature the prey list of Geocoris spp.
Description Back to Top Bigeyed bugs are small, oblong-oval lygaeids with a head that is broader than it is long, and prominent eyes that curve backward and overlap the front of the pronotum. Key to Species of Adult Geocorinae in Florida Back to Top The following key to geocorines in Florida does not include two species of Hypogeocoriswhich have been reported in Florida, but apparently are scarce or rare.
Geocoris punctipes Say Figure. Dorsal aspect of the head of Geocoris punctipes. Geocoris bullatus Saythe large bigeyed bug Figure Geocoris punctipes Say Figure Selected References Back to Top Anonymous.
Color photographs of adult Geocoris bullatus Say and Geocoris uliginosus Say. Cedar Creek Natural History Area. Field studies on egg predators of the bollworm, Heliothis zea Boddie.
Geocoris punctipes – Bugwoodwiki
Heteroptera or true bugs of Eastern North America, with especial reference to the faunas of Indiana and Florida. Some chinch bugs aren’t. Weeds Trees and Turf 7: Life history of Geocoris punctipes Hemiptera: Lygaeidae in the laboratory. Annals of the Entomological Society of America upnctipes Keys to the families and subfamilies of the nymphs of North American Hemiptera-Heteroptera.
Proceedings of the Entomological Society of Washington Effect of time of day on surveys of predaceous insects in field crops. A key to the nymphs of the families of Hemiptera Heteroptera of America north of Mexico. Consumption by several common arthropod predators of eggs and larvae of pknctipes Heliothis species that attack cotton.
The red spider on cotton. Identification and evaluation of pink bollworm predators in southern California. Journal of Economic Entomology Plant feeding by a predaceous insect, Geocoris punctipes. A contribution to the feeding habits of the Lygaeidae Hemiptera: A generic key to the nymphs of North American Lygaeidae Hemiptera: Tamaki G, Weeks RE. Department pumctipes Agriculture Technical Bulletin Whitcomb WH, Bell K.
Predaceous insects, spiders, and punctipee of Arkansas cotton fields. Arkansas Agricultural Experiment Station Bulletin Food studies of Geocoris spp.