CHANGES IN FEEDING HABITS OF SELECTED NONTARGET AQUATIC INSECTS IN RESPONSE TO LIVE AND BACILLUS THURINGIENSIS VAR. ISRAELENSIS DE BARJAC-KILLED BLACK FLY LARVAE (DIPTERA: SIMULIIDAE)

1991 ◽  
Vol 123 (1) ◽  
pp. 179-185 ◽  
Author(s):  
Richard W. Merritt ◽  
Mark S. Wipfli ◽  
R.S. Wotton
Keyword(s):  
Bacillus Thuringiensis ◽  
Aquatic Insects ◽  
Feeding Habits ◽  
Hot Water ◽  
Black Flies ◽  
Black Fly ◽  
Nontarget Organisms ◽  
Viable Population ◽  
Fly Larvae ◽  
Dead Prey

AbstractThe effects of Bacillus thuringiensis var. israelensis de Barjac (B.t.i.) on the feeding habits of two black fly predators, Nigronia serricornis (Say) and Acroneuria lycorias (Newman), and a detritivore, Prostoia completa (Walker), were examined. We assessed whether B.t.i.-killed and hot water-killed black fly larvae were less or more desirable to these consumers than live larvae. Nigronia larvae showed no significant differences in predation on larvae within the three categories. Acroneuria nymphs consumed more live than dead prey. Experiments with the detritivore, Prostoia, showed that they preferred dead black fly larvae to live ones. Bacillus thuringiensis var. israelensis treatment may have little direct effect on nontarget organisms, but these studies indicate that there still may be consequences for predators and detritivores when a viable population of larval black flies is transformed into dead organic matter.

EFFECT OF BACILLUS THURINGIENSIS VAR. ISRAELENSIS ON A GENETICALLY-DEFINED POPULATION OF BLACK FLIES (DIPTERA: SIMULIIDAE) AND ASSOCIATED INSECTS IN A MONTANE NEW HAMPSHIRE STREAM

1984 ◽  
Vol 116 (7) ◽  
pp. 975-981 ◽  
Author(s):  
Lawrence A. Pistrang ◽  
John F. Burger
Keyword(s):  
Bacillus Thuringiensis ◽  
New Hampshire ◽  
Aquatic Insects ◽  
Weather Conditions ◽  
Black Flies ◽  
Larval Population ◽  
Black Fly ◽  
Stream Insects ◽  
Treatment Site ◽  
Fly Larvae

AbstractA small, undisturbed stream in central New Hampshire was treated for 1 min with a 10 ppm suspension of Bacillus thuringiensis var. israelensis (B.t.i.) to determine the effect on an outlet-breeding black fly population and associated nontarget aquatic insects. The black fly larval population was eliminated and susbsequent adult black fly biting activity reduced near the treatment site although weather conditions may also have contributed to an observed decrease in biting activity. Some Chironomidae were killed by B.t.i. but they were not abundant enough to adequately assess impact on their populations. Temporary increases in the drift of two Ephemeroptera and two Trichoptera species were observed following treatment. Increase in rate of drift was inversely related to increase in distance from the treatment point. Slight increases in observed drift of three Plecoptera species could not be attributed directly to the B.t.i. treatment. No direct mortality caused by B.t.i. was observed in any stream insects studied except black fly larvae and some Chironomidae.

THE INFLUENCE OF FORMULATION ON TOXICITY AND AVAILABILITY OF A PESTICIDE (METHOXYCHLOR) TO BLACK FLY LARVAE (DIPTERA: SIMULIIDAE), SOME NON-TARGET AQUATIC INSECTS AND FISH

1981 ◽  
Vol 113 (4) ◽  
pp. 281-293 ◽  
Author(s):  
R. J. Sebastien ◽  
W. L. Lockhart
Keyword(s):  
Aquatic Insects ◽  
Aquatic Organisms ◽  
Filter Feeding ◽  
Chironomid Larvae ◽  
Black Fly ◽  
Fly Larvae

AbstractTwo formulations of methoxychlor were compared with regard to toxicity and availability to aquatic organisms. A particulate formulation was less toxic than an emulsifiable formulation to chironomid larvae, stonefly nymphs, and fish. Similarly the particulate methoxychlor was less rapidly accumulated from water by those same animals than was the emulsified methoxychlor. With black fly larvae, the only filter-feeding animal used, the two formulations were about equal in toxicity, but the particulate formulation was accumulated more readily than emulsified material. Both formulations induced larvae to detach from substrate but emulsifiable methoxychlor acted more quickly. At the time of detachment, larvae exposed to the particulate formulation contained an average of 68 times more methoxychlor than larvae exposed to the emulsion.

Control of Black Fly Larvae (Diptera: Simuliidae) in the Forests of Eastern Canada by Aircraft Spraying

1960 ◽  
Vol 92 (10) ◽  
pp. 745-754 ◽  
Author(s):  
A. S. West ◽  
A. W. A. Brown ◽  
D. G. Peterson
Keyword(s):  
Black Flies ◽  
Eastern Canada ◽  
Black Fly ◽  
North Shore ◽  
The North ◽  
Fly Larvae ◽  
And Control ◽  
St Lawrence River ◽  
Made In

The results reported in this paper are part of a study of the biology and control of black flies in the forests of Eastern Canada conducted on the north shore of the St. Lawrence River, near Baie Comeau, Quebec, during 1954, 1955, and 1956. Reference to this study is made in a review by Peterson and Wolfe (1958). The identification and biology of the black flies of this region has been reported on by Wolfe and Peterson (1959) who also describe the topography of the region. The important feature of this rugged area is an abundance of fast-flowing streams which provide highly suitable environments for the development of black-fly populations.

Efficiency of filter feeding of black fly larvae (Diptera: Simuliidae)

1978 ◽  
Vol 56 (7) ◽  
pp. 1608-1623 ◽  
Author(s):  
Daniel C. Kurtak
Keyword(s):  
Laboratory Experiments ◽  
Black Flies ◽  
Natural Conditions ◽  
Filter Feeding ◽  
Black Fly ◽  
The Mean ◽  
Fly Larvae ◽  
Single Larva

Larvae of nine species of black flies were exposed to synthetic particles in the laboratory. Sizes and concentrations of particles were chosen to simulate natural conditions. Smaller particles (diameter 5–10 μm) were offered at a rate of 50–100/cephalic fan area per second, and larger ones (diameter approximately 150 μm) at 0.3–1.0/cephalic fan area per second. Experiments were conducted at water velocities of 30, 50, and 70 cm/s.In all the laboratory experiments, only a small percentage of the particles passing through an area equal to that of the cephalic fans of a single larva were ingested. Particles larger than the spacing between the fan rays were ingested more efficiently than smaller ones. At 50 cm/s, the mean percentage ingested for all species was 1.6% (0.14–8.3%) of particles 150 μm in diameter and 0.094% (0.0026–0.76%) of particles 5–10 μm in diameter. The percentage of material ingested decreased at higher concentrations and water velocities. There were significant differences among the species.Experiments were done with one of the species in the field with similar results.Based on this work, an individual black fly larva in nature probably ingests 1–10% by weight of the material passing through its cephalic fans.

Transport of Bacillus thuringiensis var. israelensis and Its Effect on Drift and Benthic Densities of Nontarget Macroinvertebrates in the Susquehanna River, Northern Pennsylvania

1994 ◽  
Vol 51 (2) ◽  
pp. 295-314 ◽  
Author(s):  
John K. Jackson ◽  
Bernard W. Sweeney ◽  
Thomas L. Bott ◽  
J. Denis Newbold ◽  
Louis A. Kaplan
Keyword(s):  
Bacillus Thuringiensis ◽  
Black Flies ◽  
Black Fly ◽  
Susquehanna River ◽  
Microbial Pesticide

The microbial pesticide Bacillus thuringiensis var. israelensis (B.t.i.) was applied aerially to suppress larval black fly populations in the Susquehanna River, Pennsylvania. We quantified (1) the passage and retention of B.t.i. spores through a 1.5-km reach and (2) changes in black fly and nontarget macroinvertebrate abundances in the drift and benthos. B.t.i. exposure in the treatment riffle was 1.16 × 105 min-spores/mL or 16 min-mg/L in 1989 and 5.20 × 104 min-spores/mL or 4.4 min-mg/L in 1990. Retention of B.t.i. within the reach was low. While black fly drift from the treatment riffle increased markedly, B.t.i. appeared to have little effect on drift densities of most nontarget macroinvertebrates during the 48-h period following application. Similarly, benthic densities of black flies in the treatment riffle decreased significantly 1 d after the B.t.i. application whereas benthic densities of most nontarget taxa in the treatment riffle and depositional zone appeared unaffected 1, 7, and 28 d following B.t.i. application. Responses potentially related to B.t.i. exposure were observed for the aquatic lepidopteran Petrophila and the chironomid Polypedilum. These results suggest that the application of B.t.i. on the Susquehanna River markedly reduces black fly populations, but does not negatively affect most nontarget macroinvertebrates.

An ecological classification of primary labral fans of filter-feeding black fly (Diptera: Simuliidae) larvae

2000 ◽  
Vol 78 (2) ◽  
pp. 199-218 ◽  
Author(s):  
R W Palmer ◽  
D A Craig
Keyword(s):  
Conceptual Model ◽  
Water Flow ◽  
Southern Africa ◽  
Complex Structure ◽  
Ecological Classification ◽  
Black Flies ◽  
Black Fly ◽  
The World ◽  
Fly Larvae

A conceptual model that uses labral-fan structure to predict the distribution of black fly species within a catchment is proposed. The model is based on water flow, seston availability, and the structure of the primary labral fans of mature black fly larvae from southern Africa. The model predicts that black fly larvae found in fast-flowing (>1.0 m/s) seston-rich (>50 mg/L) water will tend to have strong fans with a porous ray structure, whereas larvae found in slow-flowing (<0.5 m/s) seston-poor (<10 mg/L) water will tend to have weak fans with a complex structure and larvae found in water with moderate water velocities and moderate seston levels will tend to have a standard fan structure. The model was tested against black flies from other parts of the world, particularly Polynesia, and provides a useful framework for predicting the distribution of black fly species within a catchment. Exceptions to the model were found among phoretic species. The model should predict changes in black fly species in areas where anthropogenic changes to watersheds are occurring.

Control of Adult Black Flies (Diptera: Simuliidae) in the Forests of Eastern Canada by Aircraft Spraying

1960 ◽  
Vol 92 (9) ◽  
pp. 714-719 ◽  
Author(s):  
D. G. Peterson ◽  
A. S. West
Keyword(s):  
Life Histories ◽  
Black Flies ◽  
Eastern Canada ◽  
Black Fly ◽  
North Shore ◽  
The North ◽  
Fly Larvae ◽  
And Control ◽  
St Lawrence River

A study of the biology and control of black flies in the forests of Eastern Canada was conducted on the north shore of the St. Lawrence River, near Baie Comeau, Quebec, from 1954 to 1956. Reference was made to this study by Peterson and Wolfe (1958). Details on the identity of species, and studies on their life histories and habits were reported by Wolfe and Peterson (1959), while the control of black-fly larvae by aircraft spraying was described by West, Brown, and Peterson (in press). Experiments on the control of adult black flies by aircraft spraying are reported in this paper.

A PILOT BLACK FLY (DIPTERA: SIMULIIDAE) CONTROL PROGRAM USING BACILLUS THURINGIENSIS VAR. ISRAELENSIS IN NEWFOUNDLAND

1984 ◽  
Vol 116 (8) ◽  
pp. 1085-1096 ◽  
Author(s):  
M. H. Colbo ◽  
H. O'Brien
Keyword(s):  
Bacillus Thuringiensis ◽  
Cold Water ◽  
Control Program ◽  
Black Flies ◽  
Small Stream ◽  
Black Fly ◽  
Larval Stages ◽  
Population Reduction ◽  
Stream System ◽  
Fly Control

AbstractA pilot black fly control program using Bacillus thuringiensis var. israelensis on a small stream system near St. John's, Newfoundland resulted in a 70% or greater population reduction of adult black flies from the previous year. The species present in the system were Prosimulium mixtum, Stegopterna mutata, Eusimulium vernum, Simulium tuberosum, S. venustum/verecundum complex, and S. vittatum. The formulation used was Teknar® flowable concentrate (Sandoz Inc.) rated at 600 ITU/mg which proved effective against the larval stages of all black fly species at a dose of 10 ppm for 1 min. The results indicated that this agent will be effective if applied at the appropriate locations and times. The 1-min dose was practical except in very cold water (0°–7 °C) where a 5-min or longer dose may be required. The unpredictable relief pattern of the northern streams resulted in a highly variable downstream carry for the B.t.i. Therefore application sites must be determined by a stream survey and not just from discharge characteristics.

scholarly journals Assessment of Bacillus thuringiensis subsp. israelensis Strain AM65-52 aqueous suspension for the control of black fly populations, (Simulium spp.) in northern Italy

2013 ◽  
Vol 45 (3) ◽  
pp. 18
Author(s):  
P. Radeghieri ◽  
F. Santi ◽  
S. Maini
Keyword(s):  
Bacillus Thuringiensis ◽  
Larvicidal Activity ◽  
Aqueous Suspension ◽  
Larval Mortality ◽  
Field Trials ◽  
Northern Italy ◽  
Application Site ◽  
Black Flies ◽  
Black Fly ◽  
Plain Streams

Four field trials were conducted in Mantua province in northern Italy to evaluate the effect of the <em>Bacillus thuringiensis</em> subsp. israelensis Strain AM65-52 based VectoBac® 12 AS larvicide on black flies. Our objective was to examine and compare the efficacy of different concentrations of this microbial larvicide in small plain streams. Larvicidal activity was exhibited in all trials. VectoBac® 12 AS at 2.5 ppm/min rate generated larval mortality from the treatment point to 500 meters downstream. Larvae mortality (over 80%) was observed for 3500 meters downstream of the application site when a concentration of 40 ppm/min was applied.

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