PREDATORY BEHAVIOR OF THE CLERID BEETLE THANASIMUS DUBIUS (COLEOPTERA: CLERIDAE) ON THE SOUTHERN PINE BEETLE (COLEOPTERA: SCOLYTIDAE)

1981 ◽  
Vol 113 (1) ◽  
pp. 35-43 ◽  
Author(s):  
J. L. Frazier ◽  
T. E. Nebeker ◽  
R. F. Mizell ◽  
W. H. Calvert
Keyword(s):  
Handling Time ◽  
Predatory Behavior ◽  
Dendroctonus Frontalis ◽  
Southern Pine Beetle ◽  
Thanasimus Dubius ◽  
Southern Pine ◽  
Male And Female ◽  
Pine Beetle ◽  
Southern Pine Beetles ◽  
Pine Beetles

AbstractThe behavior of adults of clerid beetle Thanasimus dubius (F.) preying upon adult southern pine beetles, Dendroctonus frontalis Zimmerman, in an arena in the laboratory is described by classifying the acts according to their consequences. A sequence of five stereotyped acts is performed by the predator: either searching or ambush, seizure of prey, alignment of prey, consumption of prey, and grooming. Handling time by the predator consists of the sums of the durations of the four acts of seizure through grooming, which was not significantly different for male and female predators, but was significantly longer for male prey (13.81 min) than for female prey (10.49 min). Consumption of prey (8–9 min) is the major component of handling time. Predators searched or waited in ambush an average of 5.8 mm before seizing a prey, and captured prey with an efficiency of 72%. Blinding predators had no significant effect on their efficiency at capturing prey. Maxillary and labial palpectomy alone or in combination significantly reduced efficiency of capture, and reduced numbers of prey consumed.

Temporal Relationship Between Southern Pine Beetle (Coleoptera: Scolytidae) and Pinewood Nematode Infestations in Southern Pines

1992 ◽  
Vol 27 (3) ◽  
pp. 194-201 ◽  
Author(s):  
D. N. Kinn ◽  
M. J. Linit
Keyword(s):  
Bursaphelenchus Xylophilus ◽  
Dendroctonus Frontalis ◽  
Southern Pine Beetle ◽  
Pinewood Nematode ◽  
Pinus Echinata ◽  
Southern Pine ◽  
Pine Beetle ◽  
Pinus Taeda L ◽  
Southern Pine Beetles ◽  
Pine Beetles

The incidence of feeding scars of the cerambycid vectors of the pinewood nematode (Bursaphelenchus xylophilus (Steiner and Buhrer) Nickel) on twigs of loblolly (Pinus taeda L.) and shortleaf (Pinus echinata Mill.) pines in central Louisiana was determined. Feeding scars on twigs taken from pines felled at random were compared to those on twigs taken from pines adjacent to southern pine beetle (Dendroctonus frontalis Zimmermann) infestations. Additionally, the presence of pinewood nematode in trees attacked by southern pine beetle was followed through the course of beetle development. Significantly more cerambycid feeding scars were present on twigs of trees located near the advancing edge of a southern pine beetle infestation than on twigs not adjacent or near any known southern pine beetle infestation. From 82 to 100% of the trees sampled adjacent to bark beetle infestations had been fed upon by cerambycids. Pinewood nematodes were recovered from 79% of these trees. The incidence of nematodes in the boles of trees attacked by southern pine beetles increased as immature beetles entered their later instars. The highest incidence of nematodes was from trees recently vacated by southern pine beetles. Trees killed by the southern pine beetle may thus serve as reservoirs for the pinewood nematode and its cerambycid vectors and lead to the infestation of adjacent trees and facilitate subsequent SPB colonization.

Examination of Midgut Proteinases of the Adult Southern Pine Beetle (Coleoptera: Scolytidae)

1994 ◽  
Vol 29 (4) ◽  
pp. 457-465 ◽  
Author(s):  
B. R. Coppedge ◽  
J. M. Jones ◽  
G. W. Felton ◽  
F. M. Stephen
Keyword(s):  
Digestive Enzymes ◽  
Cysteine Proteinase ◽  
Dendroctonus Frontalis ◽  
Southern Pine Beetle ◽  
Southern Pine ◽  
Widespread Occurrence ◽  
Pine Beetle ◽  
Southern Pine Beetles ◽  
Pine Beetles

The midgut of adult southern pine beetles, Dendroctonus frontalis Zimmermann (Coleoptera: Scolytidae), contains digestive enzymes with optimal proteolytic activity in vitro near pH 7. General proteinase activity was significantly inhibited by serine and cysteine proteinase class inhibitors, while limited activation by cysteine proteinase class activators was apparent. These results indicate that both cysteine and serine proteinases are present in the adult midgut. The presence of both proteinase classes in adult southern pine beetles coincides with previous studies showing widespread occurrence of these two classes of proteinases as digestive enzymes in midguts of other coleopteran species, but represents one of few beetle species known to possess both proteinase classes simultaneously.

scholarly journals Evaluation of General-Use Insecticides for Preventing Host Colonization by New Jersey Southern Pine Beetles

2015 ◽  
Vol 41 (2) ◽  
Author(s):  
B.L. Strom ◽  
W.K. Oldland ◽  
J.R. Meeker ◽  
J. Dunn
Keyword(s):  
New Jersey ◽  
Bark Beetles ◽  
Dry Weight ◽  
Dendroctonus Frontalis ◽  
Southern Pine Beetle ◽  
Southern Pine ◽  
Pine Engraver ◽  
Pine Beetle ◽  
Southern Pine Beetles ◽  
Pine Beetles

Four general-use insecticides (AstroR, OnyxR, DominionR Tree & Shrub, and Xytect 2FR) were evaluated for their effectiveness at preventing attacks by the southern pine beetle (SPB) (Dendroctonus frontalis) and the small southern pine engraver (Ips avulsus) using a previously developed small-bolt method. Evaluations were conducted between 58 and 126 days post treatment. Southern pine beetles from New Jersey and Mississippi, U.S., were evaluated using a mixture of field and laboratory small-bolt trials; beetle origin did not appear to affect results. Astro and Onyx bole sprays were effective at reducing or eliminating attack by SPB, while the imidacloprid soil drench products (Dominion and Xytect) were ineffective. With I. avulsus in Louisiana, U.S., Astro was effective at reducing bole utilization at 58 and 83 days posttreatment but failed at 126 days. Onyx, Dominion, and Xytect were ineffective against I. avulsus in these tests. Imidacloprid phloem residues averaged 0.74 (μg/g phloem dry weight) for Dominion and 1.31 for Xytect, values that are similar to other studies but low for purposes of control. These results support previous findings that systemic imidacloprid is ineffective for protecting pines against Dendroctonus bark beetles and that bole sprays with bifenthrin or permethrin can be effective. However, permethrin was the only active ingredient that was effective against I. avulsus in the current study.

VARIATION IN SOUTHERN PINE BEETLE ATTACK HEIGHT ASSOCIATED WITH PHORETIC UROPODID MITES

1978 ◽  
Vol 110 (3) ◽  
pp. 249-251 ◽  
Author(s):  
D. N. Kinn ◽  
J. J. Witcosky
Keyword(s):  
Dendroctonus Frontalis ◽  
Southern Pine Beetle ◽  
Southern Pine ◽  
Alpha Pinene ◽  
Pine Beetle ◽  
Loblolly Pines ◽  
Southern Pine Beetles ◽  
Pine Beetles

AbstractSouthern pine beetles (Dendroctonus frontalis) carrying phoretic Trichouropoda australis deutonymphs were caught in bucket traps baited with frontalin-alpha pinene at heights of 3, 6, and 9 m on the boles of loblolly pines. Of 8475 beetles collected, 36.3% carried uropodids or their pedicels. Beetles trapped at 3 m carried more pedicels than those trapped at 6 or 9 m, indicating that the flight of beetles is influenced by the presence of phoretic mites. Re-emerging parent beetles can be differentiated from brood adults by the color of the mite pedicels.

MITES PHORETIC ON THE SOUTHERN PINE BEETLE: WHEN AND WHERE THEY ATTACH

1978 ◽  
Vol 110 (5) ◽  
pp. 557-558 ◽  
Author(s):  
L. M. Roton
Keyword(s):  
Dendroctonus Frontalis ◽  
Host Tree ◽  
Southern Pine Beetle ◽  
Southern Pine ◽  
Outer Bark ◽  
Host Trees ◽  
Pine Beetle ◽  
Three Stages ◽  
Southern Pine Beetles ◽  
Pine Beetles

Southern pine beetles, Dendroctonus frontalis Zimmerman, often carry mites as they emerge from host trees. At least 14 species of mites are phoretic (Moser and Roton 1971). But for D. frontalis, it is not clearly known where in the host tree and at what stage of the beetle's development the mites attach themselves. After the beetle larvae construct oval feeding cells, they develop in three stages: pupa, callow adults, and brood adults (Fig. 1). In trees with thick bark, the larvae bore into the outer bark from within, construct pupal cells, and pupate. But in trees with thin bark, the larvae pupate directly in the larval cells next to the xylem. Thus, the larval galleries in either case are in the living phloem adjacent to the sapwood.

VARIATION IN FEMALE SOUTHERN PINE BEETLE SIZE AND LIPID CONTENT IN RELATION TO FUNGAL ASSOCIATES

1995 ◽  
Vol 127 (2) ◽  
pp. 145-154 ◽  
Author(s):  
Bryan R. Coppedge ◽  
Frederick M. Stephen ◽  
Gary W. Felton
Keyword(s):  
Lipid Content ◽  
Dendroctonus Frontalis ◽  
Southern Pine Beetle ◽  
Southern Pine ◽  
Adult Females ◽  
Pine Beetle ◽  
Symbiotic Fungi ◽  
Fungal Associates ◽  
Southern Pine Beetles ◽  
Pine Beetles

AbstractFemale southern pine beetles, Dendroctonus frontalis Zimmermann, may propagate two species of symbiotic fungi in a prothoracic mycangium. Females can carry either Ceratocystiopsis ranaculosus Bridges and Perry or an unnamed basidiomycete or both; some carry no fungi. Thus, females can be categorized into one of four groups based on mycangial content. We examined size and lipid content of emerging brood adult females based on these mycangial fungal classes. Female beetles carrying the basidiomycete, either alone or in combination with C. ranaculosus, were larger, heavier, and contained more lipid than did females carrying only C. ranaculosus. Size and lipid content also varied by season, as did the number of females carrying different fungal combinations. Regression analysis showed that variation in the occurrence of the basidiomycete was significantly related to variation in averages of beetle size and lipid content measurements.

scholarly journals Retention Time in Three Nursery Container Volumes Impacts Root Architecture

2015 ◽  
Vol 41 (3) ◽  
Author(s):  
Edward Gilman ◽  
Maria Paz ◽  
Chris Harchick
Keyword(s):  
Bark Beetles ◽  
Root Architecture ◽  
Dry Weight ◽  
Dendroctonus Frontalis ◽  
Southern Pine Beetle ◽  
Southern Pine ◽  
Pine Engraver ◽  
Pine Beetle ◽  
Southern Pine Beetles ◽  
Pine Beetles

Four general-use insecticides (Astro®, Onyx®, Dominion® Tree & Shrub, and Xytect 2F®) were evaluated for their effectiveness at preventing attacks by the southern pine beetle (SPB) (Dendroctonus frontalis) and the small southern pine engraver (Ips avulsus) using a previously developed small-bolt method. Evaluations were conducted between 58 and 126 days post treatment. Southern pine beetles from New Jersey and Mississippi, U.S., were evaluated using a mixture of field and laboratory small-bolt trials; beetle origin did not appear to affect results. Astro and Onyx bole sprays were effective at reducing or eliminating attack by SPB, while the imidacloprid soil drench products (Dominion and Xytect) were ineffective. With I. avulsus in Louisiana, U.S., Astro was effective at reducing bole utilization at 58 and 83 days posttreatment but failed at 126 days. Onyx, Dominion, and Xytect were ineffective against I. avulsus in these tests. Imidacloprid phloem residues averaged 0.74 (μg/g phloem dry weight) for Dominion and 1.31 for Xytect, values that are similar to other studies but low for purposes of control. These results support previous findings that systemic imidacloprid is ineffective for protecting pines against Dendroctonus bark beetles and that bole sprays with bifenthrin or permethrin can be effective. However, permethrin was the only active ingredient that was effective against I. avulsus in the current study.

EFFECTS OF MYCANGIAL FUNGI ON GALLERY CONSTRUCTION AND DISTRIBUTION OF BLUESTAIN IN SOUTHERN PINE BEETLE-INFESTED PINE BOLTS

1985 ◽  
Vol 20 (2) ◽  
pp. 271-275 ◽  
Author(s):  
J. Robert Bridges ◽  
Thelma J. Perry
Keyword(s):  
Southern Pine Beetle ◽  
Southern Pine ◽  
Pine Beetle ◽  
Southern Pine Beetles ◽  
Pine Beetles ◽  
Ceratocystis Minor

Southern pine beetles, Dentroctonus frontalis Zimmermann, treated to remove their mycangial fungi, were infected with Ceratocystis minor (Hedgcock) Hunt spores and placed in freshly-cut pine bolts. Galleries constructed by beetles without mycangial fungi were significantly shorter and contained significantly more bluestain than galleries constructed by beetles with mycangial fungi. It was concluded that southern pine beetle mycangial fungi limit the distribution of bluestain in southern pine beetle-infested trees. Inhibition of the spread of the bluestain fungus by mycangial fungi may be necessary for optimal beetle development.

Extended Development in Thanasimus dubius (F.) (Coleoptera: Cleridae), a Predator of the Southern Pine Beetle

1996 ◽  
Vol 31 (1) ◽  
pp. 123-131 ◽  
Author(s):  
John D. Reeve ◽  
John A. Simpson ◽  
Jonny S. Fryar
Keyword(s):  
Dendroctonus Frontalis ◽  
Pine Forests ◽  
Southern Pine Beetle ◽  
Thanasimus Dubius ◽  
Southern Pine ◽  
Natural Conditions ◽  
Pine Beetle ◽  
Important Predator ◽  
Emergence Traps ◽  
Major Pest

Thanasimus dubius (F.) is an important predator of the southern pine beetle, Dendroctonus frontalis Zimmermann, a major pest of pine forests in the southern United States. We examined the development of T. dubius in the field using emergence traps, and by sampling the bark of trees previously attacked by D. frontalis. Over a 2-year period, several distinct episodes of T. dubius emergence occurred in trees enclosed by emergence traps, and bark sampling of other trees uncovered many T. dubius immatures almost 2 years after attack by D. frontalis. These results indicate that T. dubius development may be significantly longer and more variable under natural conditions than previously thought, and suggest that some individuals may undergo a diapause.

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