Infection of the gypsy moth,Porthetria dispar with the entomogenous fungus,Conidiobolus coronatus

Entomophaga ◽  
1974 ◽  
Vol 19 (3) ◽  
pp. 353-360 ◽  
Author(s):  
G. C. Hartmann ◽  
S. S. Wasti
Keyword(s):  
Gypsy Moth ◽  
Entomogenous Fungus ◽  
Conidiobolus Coronatus ◽  
Porthetria Dispar

Experimental parasitization of larvae of the gypsy moth, Porthetria dispar (L.), with the entomogenous fungus, Beauveria bassiana (Balsamo) Vuill

Parasitology ◽  
1975 ◽  
Vol 70 (3) ◽  
pp. 341-346 ◽  
Author(s):  
S. S. Wasti ◽  
G. C. Hartmann
Keyword(s):  
Beauveria Bassiana ◽  
Gypsy Moth ◽  
Post Inoculation ◽  
Entomogenous Fungus ◽  
Porthetria Dispar ◽  
Host Penetration ◽  
Fungus Beauveria Bassiana ◽  
Wax Moth

Second-instar larvae of the gypsy moth, Porthetria dispar (L.) were infected with Beauveria bassiana (Balsamo) Vuill. by allowing larvae to crawl over sporulating cultures of the fungus. Virulence of the pathogen was increased by inoculating larvae of the wax moth, Galleria melonella (L.), twice in serial succession. Observations were made on the infectivity and histopathology of the parasite in the host. Penetration of the cuticle occurred 24 h after inoculation and at 64 h post-inoculation the interior was completely filled with hyphae. Penetration of the gut wall was also observed.

scholarly journals NOTES ON PREDACEOUS HETEROPTERA, WITH PROF. UHLER'S DESCRIPTION OF TWO SPECIES

1897 ◽  
Vol 29 (5) ◽  
pp. 115-118
Author(s):  
A. H. Kirkland
Keyword(s):  
Gypsy Moth ◽  
Food Supply ◽  
The Other ◽  
Field Observations ◽  
Large Numbers ◽  
Porthetria Dispar ◽  
The Common ◽  
Tent Caterpillars ◽  
Tent Caterpillar

During the month of May, 1896, while making field observations in Malden and Medford, Mass., upon the insects known to attack the gypsy moth (Porthetria dispar), I found that many of the common predaceous bugs upon emerging from hibernation greedily availed themselves of the food supply offered by the tent caterpillar and destroyed large numbers of this insect. Podisus placidus, P. serieventris, P. modestus, Dendrocoris humeralis, Euschistus fissilis, E. tristigmus, E. ictericus, E. politus n. sp., Menecles insertus and Diplodus lividus were often found feeding upon partially grown tent caterpillars. Podisus placidus and P. serieventris enter the tents and prey upon the inmates, but the other species generally attacked the larvæ while they were feeding. The species of Euschistus are the least predaceous and it is probable that they naturally feed more upon plants than upon insects.

PRE-MATING SEXUAL ACTIVITY OF GYPSY MOTH MALES IN SMALL PLOT FIELD TESTS (LYMANTRIA (= PORTHETRIA) DISPAR (L.): LYMANTRIIDAE)

1976 ◽  
Vol 108 (4) ◽  
pp. 439-448 ◽  
Author(s):  
J. V. Richerson ◽  
E. A. Brown ◽  
E. Alan Cameron
Keyword(s):  
Gypsy Moth ◽  
Sexual Communication ◽  
Field Tests ◽  
Baited Traps ◽  
Gypsy Moths ◽  
Porthetria Dispar ◽  
Relative Attractiveness ◽  
Small Plot ◽  
Previous Mating ◽  
Cotton Wick

AbstractPre-mating behavior of male gypsy moths was investigated in 0.2 ha circular plots containing from 0 to 72 virgin females/plot in untreated areas and in areas treated with an aerial application of 20 g/ha microencapsulated disparlure. Male moths in both treated and untreated plots oriented initially to trees, not directly to females. Mating was disrupted in treated plots but males continued search behavior. No anemotactic behavior was evident in either treated plots or untreated plots with females. In untreated plots, male moths were not caught on sticky panels (panels suspended at 2, 4, and 6 m) higher than pheromone baited traps set at 2 m. In treated plots, equal number of males were caught at all panel heights and in baited traps at 2 m. Previous mating and pheromone exposure histories of males did not affect the response of these males to traps baited with 4–5 mg of disparlure in untreated plots. In a test of the relative attractiveness of a cotton wick and a new laminated bait dispenser in Johnson traps, traps baited with the laminated dispenser had a greater male moth catch/male contact to trap than the traps baited with the cotton wick. Not all males contacting the Johnson trap were caught. A mode of action for disparlure as a disruptive agent in the long range sexual communication system of gypsy moth is proposed.

Some Effects of Gamma Irradiation on the Gypsy Moth, Porthetria dispar

1964 ◽  
Vol 57 (6) ◽  
pp. 986-990 ◽  
Author(s):  
P. A. Godwin ◽  
H. D. Rule ◽  
W. E. Waters
Keyword(s):  
Gamma Irradiation ◽  
Gypsy Moth ◽  
Porthetria Dispar

SILKING BEHAVIOR OF THE GYPSY MOTH, PORTHETRIA DISPAR

1967 ◽  
Vol 99 (11) ◽  
pp. 1145-1149 ◽  
Author(s):  
David E. Leonard
Keyword(s):  
Gypsy Moth ◽  
Larval Instar ◽  
Diel Periodicity ◽  
First Instar ◽  
Porthetria Dispar ◽  
Late Instar

AbstractAfter feeding, gypsy moth larvae construct a silk mat (resting mat) on which they remain. Prior to molting, this mat is reinforced, or a new, dense mat is constructed (molting mat). Late in the last larval instar, a sparse cocoon is constructed. When larvae are starved, a shift in behavior is noted, with increased locomotion, irritability, and the trailing of a strand of silk as larvae wander. First-instar larvae, quiescent and anchored on resting mats, are not readily induced to spin down on silk threads; hence are not readily dispersed by wind. Hungry first-instar larvae, more apt to be spinning down, are presumed to be more readily dispersed by wind. Larvae which undergo an additional instar have a longer prefeeding phase and might be more readily dispersed than "normal' larvae. The effects of hunger may also cause the shift in diel periodicity of mid- and late-instar larvae, resulting in some dispersal of these larvae away from areas where food will be depleted.

DISCRIMINATION BETWEEN PARASITIZED AND NONPARASITIZED HOSTS BY THE GYPSY MOTH LARVAL PARASITOID, APANTELES MELANOSCELUS (HYMENOPTERA: BRACONIDAE)

1976 ◽  
Vol 108 (4) ◽  
pp. 395-400 ◽  
Author(s):  
Ronald M. Weseloh
Keyword(s):  
Gypsy Moth ◽  
Larval Parasitoid ◽  
Porthetria Dispar

AbstractObservations of behavior and dissections of hosts were carried out to investigate the ability of Apanteles melanoscelus Ratzeburg (Hymenoptera: Braconidae) to distinguish between parasitized and nonparasitized gypsy moth larvae, Porthetria dispar (L.) (Lepidoptera: Lymantriidae). Fewer host examinations occurred and fewer eggs were laid in hosts which had been parasitized 0–9 days previously than in those which had never been parasitized. However, superparasitism occurred readily especially when few unparasitized hosts were available. By dissecting hosts which were parasitized more than once it was possible to investigate competition between supernumerary parasitoids. First instars are eliminated by some mechanism (possibly active combat), and older parasitoids eliminate younger ones.

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