common name: big-eyed bugs
scientific name: Geocoris spp. (Insecta: Hemiptera: Lygaeidae)

Introduction - Distribution - Description - Key to Species of Adult Geocorinae in Florida - Key to Late Instar Nymphs of Florida Species of Geocoris - Bionomics - Selected References

Introduction

Big-eyed bugs are small insects (approximately 1/6 inch long) that occur in many parts of the world. They are generally regarded as beneficial because they prey upon numerous kinds of insect and mite pests of turf, ornamental and agricultural crops. Big-eyed bugs are among those insects receiving research attention in Florida (and elsewhere) for their value as predators. To aid in identification of big-eyed bugs in Florida, a key to adults and late instar nymphs is provided in this publication.

adult

adult feeding on whitefly

Distribution

Geocoris bullatus (Say), the large bigeyed bug, is widely distributed in the United States and Canada, from coast to coast. There are numerous Florida records from the northern border south to Key West. G. punctipes (Say) 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. G. uliginosus (Say) ranges over most of the United States and southern Canada. In Florida, G. uliginosus is known at least as far south as Ft Myers.

G. bullatus

G. punctipes

G. uliginosus

Description

Big-eyed bugs are small, oblong-oval lygaeids having the head broader than long and prominent eyes which 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 to separate big-eyed bugs from similar bugs. A distinguishing feature of adult big-eyed bugs is the very short or absent claval commissure. Lygaeids such as chinch bugs (Blissus spp.), false chinch bugs (Nysius spp.), and pameras (Pachybrachius spp.) are sometimes confused with big-eyed bugs, but these genera have a claval commissure approximately half as long as the scutellum. Also the head has more of a triangular shape in these lygaeids. Caplan (1968) emphasized the need for turf specialists to distinguish between big-eyed bugs and chinch bugs. Misidentification could result in a chinch bug spray directed against geocorines, resulting in needless loss of money and beneficial insects.

claval commissure on Geocoris and Pachybrachius spp.

The following key to geocorines in Florida does not include two species of Hypogeocoris, which have been reported in Florida, but apparently are scarce or rare. Some minor variations in Geocoris bullatus (Say) and G. uliginosus (Say) have been formalized as subspecies, but will not be considered in this circular.

Key to Species of Adult Geocorinae in Florida

1. Beak with segment I (basal) longer than II; head (except in G. punctipes) punctulate (with small pits) or rugulose (minutely wrinkled) . . . . . Geocoris 2
1'. Beak with segment I subequal to or shorter than II; head smooth, impunctate, shining . . . . . Hypogeocoris

2. Nearly all black above except for pale border along each side; scutellum entirely black (Fig. 3) . . . . . G. uliginosus (Say) 1832
2'. Mostly pale above; scutellum with a pair of pale areas or spots (Fig. 4, 5) . . . . . 3

3. Scutellum with a pair of prominent, smooth (impunctate), calloused 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. 6), length 3.5 to 4.2 mm (Fig. 4) . . . . . G. punctipes (Say) 1832
3'. 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; groove of tylus not extending back onto vertex; vertex lacking transverse sulcus; length 3.0 to 3.5 mm (Fig. 5) . . . . . G. bullatus (Say) 1832, the large bigeyed bug

Tranverse sulcus of G. punctipes

Key to Late Instar Nymphs of Florida Species of Geocoris

To make sure a nymph is a lygaeid, consult the key by Herring and Ashlock (1971) and/or the one by DeCoursey (1971). To key a lygaeid nymph to genus, consult Sweet and Slater (1961).

1. Dorsal ground color of head and thorax dark brown (Fig. 7) . . . . . G. uliginosus (Say)
1'. Dorsal ground color of head and thorax pale (irregular dark spots often present) . . . . . 2

G. uliginosus nymph

2. 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 basolaterad; 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 dorso-apical pale spot (Fig. 8) . . . . . G. bullatus (Say), the large bigeyed bug
2'. 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 pairs), the 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. 9) . . . . . G. punctipes (Say)

G. bullatus nymph

G. punctipes nymph

Bionomics

The literature on the food habits and life histories of Geocoris spp. is too extensive for more than a token review here. The most abundant big-eyed bug in Florida and the southeastern United States is G. punctipes (Say). McGregor and McDonough (1917) reported the life history of G. punctipes at Batesburg, South Carolina, finding the average development time from egg to adult was 30 days. Nymphs consumed an average of 47 mites, and adults an average of 83 "red spider" mites on cotton per day. York (1944) reported that adult Geocoris required either free moisture or plant moisture as well as insect prey. Sweet (1960) found that Geocoris adults can survive on sunflower seeds and water, without insect food.

Dumas et al. (1962) found more G. punctipes in the morning than at midday or evening, either by sweep net sampling or complete plant examination in Arkansas soybean fields. Bell and Whitcomb (1964) reported that in Arkansas G. punctipes and G. uliginosus were among the most abundant and important predators of bollworm eggs, Helicoverpa (=Heliathis) zea (Boddie) on cotton from mid- June until September. Whitcomb and Bell (1964) reported that big-eyed 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 (1967) reported on the life history of G. punctipes in the laboratory. Lingren et al. (1968) reported G. punctipes was a more effective predator than G. uliginosus against Helicoverpa (=Heliathis) spp. Stoner (1970) found that G. punctipes apparently needed prey for proper development and fecundity. Orhanides et al. (1971) reported that G. punctipes was an effective predator of the pink bollworm, Pectinophora gossypiella (Saunders) in southern California cotton fields. Tamaki and Weeks (1972) listed 46 references, itemized from the literature the prey list of Geocoris spp., and presented extensive research results from a five year project on Geocoris in the Yakima Valley of Washington, including data on G. bullatus.

Selected References

Author: F. W. Mead, Florida Department of Agriculture and Consumer Services, Division of Plant Industry.
Originally published as DPI Entomology Circular 121.
Photographs: Division of Plant Industry, University of Florida and Jack Dykinga, USDA
Project Coordinator: Thomas Fasulo, University of Florida
Publication Number: EENY-252
Publication Date: November 2001. Latest revision: October 2004.
Copyright 2001-2004 University of Florida

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