FIELD TESTS WITH BACILLUS THURINGIENSIS BERLINER AND DDT FOR CONTROL OF TWO PESTS OF CABBAGE

1961 ◽  
Vol 41 (2) ◽  
pp. 428-430 ◽  
Author(s):  
C. J. S. Fox ◽  
R. P. Jaques
Keyword(s):  
Nova Scotia ◽  
Bacillus Thuringiensis ◽  
Pieris Rapae ◽  
Diamondback Moth ◽  
Field Tests ◽  
Good Control ◽  
Commercial Preparation

At Kentville, Nova Scotia, during 1960, seven spray schedules including a commercial preparation of Bacillus thuringiensis Berliner and DDT were evaluated in the field for control of the imported cabbageworm, Pieris rapae (L.), and larvae of the diamondback moth, Plutella maculipennis (Curt.). Up to three spray treatments were applied at 2-week intervals. Three applications of B. thuringiensis or one application of DDT followed by two of B. thuringiensis gave good control of both insects. In general, DDT and B. thuringiensis were equally effective against imported cabbageworm but DDT was more effective against larvae of the diamondback moth.

THE INFLUENCE OF SOME FUNGICIDES ON THE EFFECTIVENESS OF SPRAYS OF BACILLUS THURINGIENSIS BERLINER

1963 ◽  
Vol 43 (3) ◽  
pp. 301-306 ◽  
Author(s):  
R. P. Jaques
Keyword(s):  
Bacillus Thuringiensis ◽  
Pieris Rapae ◽  
Mercuric Acetate ◽  
Diamondback Moth ◽  
Field Tests ◽  
Powder Preparation ◽  
Winter Moth ◽  
Eastern Tent Caterpillar ◽  
Wettable Powder ◽  
Tent Caterpillar

The effect of five common orchard fungicides, captan, dodine, dichlone, glyodin, and a mercuric acetate eradicant, on the activity of a wettable powder preparation of spores of Bacillus thuringiensis Berliner was studied in the laboratory, orchard, and field, using pests of apple and cabbage as test insects. Glyodin was the only one of the fungicides tested in the laboratory that significantly reduced the activity of the spores against larvae of the eastern tent caterpillar, Malacosoma americanum (Fabricius), and the winter moth, Operophthera brumata (Linnaeus). In the orchard and field tests the combining of glyodin or dodine with sprays of the spores reduced mortality of larvae of the winter moth, the imported cabbageworm, Pieris rapae (Linnaeus), and the diamondback moth, Plutella maculipennis (Curtis).

PRELIMINARY OBSERVATIONS ON BIOLOGICAL INSECTICIDES AGAINST IMPORTED CABBAGEWORM

1966 ◽  
Vol 46 (5) ◽  
pp. 497-499 ◽  
Author(s):  
C. J. S. Fox ◽  
R. P. Jaques
Keyword(s):  
Nova Scotia ◽  
Bacillus Thuringiensis ◽  
Parasitic Nematode ◽  
Pieris Rapae ◽  
Granulosis Virus ◽  
Adequate Control ◽  
Bacterium Bacillus

At Kentville, Nova Scotia, in 1963 and 1965, three biological insecticides were evaluated in the field for control of the imported cabbageworm, Pieris rapae (L.) (Lepidoptera:Pieridae). One or two spray treatments were applied at 9- or 14-day intervals. All treatments significantly reduced numbers of the insect. The bacterium Bacillus thuringiensis Berliner applied once gave the best control at first but in 1965 did not maintain adequate control to harvest. A granulosis virus was as effective as DDT followed by an application of mevinphos. The parasitic nematode DD136 gave control late in the season.

A COMPARISON OF LABORATORY AND FIELD TESTS OF BACILLUS SPHAERICUS STRAIN 1593 AND BACILLUS THURINGIENSIS VAR. ISRAELENSIS AGAINST AEDES STIMULASS LARVAE (DIPTERA: CULICIDAE)

1982 ◽  
Vol 114 (1) ◽  
pp. 55-61 ◽  
Author(s):  
Stephen P. Wraight ◽  
Daniel Molloy ◽  
Patricia McCoy
Keyword(s):  
Bacillus Thuringiensis ◽  
Entire Range ◽  
Field Tests ◽  
Bacillus Sphaericus ◽  
Toxic Material ◽  
Mean Temperature

AbstractBacillus thuringiensis var. israelensis (serotype H-14) and B. sphaericus strain 1593 were tested against Aedes stimulons larvae in the laboratory and in 38-cm-diam, open-ended cylinders embedded in the bottom detritus of a woodland pool. Estimates of LC50 were lower against fourth instars in the field at a mean temperature of 15.9 °C than in the laboratory at 21.1 °C. The greater efficacy in the field was attributed to high daytime water temperatures (mean 20.5 °C) following treatment and exposure of the larvae to substantially greater amounts of toxic material in a larger volume of water than in the laboratory. The regression of probit on log10 concentration was not linear over the entire range of mortality caused by B. sphaericus, increasing the difficulty of estimation of LC values. Bacillus sphaericus was significantly less active than B. thuringiensis.

Effect of Treatment With 3-Octylthio-1,1,1-Trifluoropropan-2-One in the Diamondback Moth (Lepidoptera: Plutellidae) to the Toxicity of Diafenthiuron, Indoxacarb, and Bacillus thuringiensis

2020 ◽  
Vol 113 (3) ◽  
pp. 1419-1425 ◽  
Author(s):  
Jingfei Huang ◽  
Sufen Tian ◽  
Ke Ren ◽  
Yong Chen ◽  
Shuo Lin ◽  
...  
Keyword(s):  
Bacillus Thuringiensis ◽  
Juvenile Hormone ◽  
Combination Treatment ◽  
Insect Pest ◽  
Diamondback Moth ◽  
Treatment Method ◽  
Juvenile Hormone Esterase ◽  
Trifluoromethyl Ketones ◽  
Insecticide Synergist ◽  
Almost All

Abstract The diamondback moth, Plutella xylostella (L.), is a worldwide insect pest of cruciferous crops. Although insecticides have long been used for its control, diamondback moth rapidly evolves resistance to almost any insecticide. In insects, juvenile hormone (JH) is critically involved in almost all biological processes. The correct activity of JH depends on the precise regulation of its titer, and juvenile hormone esterase (JHE) is the key regulator. Thus, JH and JHE have become important targets for new insecticide development. Trifluoromethyl ketones are specific JHE inhibitors, among which 3-octylthio-1,1,1-trifluoropropan-2-one (OTFP) has the highest activity. The interaction effects between pretreatment with or combination of OTFP and the insecticides diafenthiuron, indoxacarb, and Bacillus thuringiensis (Bt) were investigated in diamondback moth larvae to determine OTFP’s potential as an insecticide synergist. In third-instar larvae, both pretreatment and combination treatment with OTFP decreased or antagonized the toxicities of diafenthiuron, indoxacarb, and Bt at all set concentrations. In fourth-instar larvae, combination treatment with OTFP decreased or antagonized the toxicities of diafenthiuron and indoxacarb at all set concentrations. However, it increased or synergized the toxicity of Bt at lower concentrations despite the limited effect at higher concentrations. Our results indicated that the effect of OTFP on the toxicities of insecticides varied with the type and concentration, larval stage, and treatment method. These findings contribute to the better use of OTFP in diamondback moth control.

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