Persistence of Diflubenzuron on Soybean Leaves

2004 ◽  
Vol 39 (3) ◽  
pp. 398-406
Author(s):  
Lloyd M. Southwick ◽  
Melissa M. Willrich ◽  
James L. Fouss ◽  
David J. Boethel
Keyword(s):  
Glycine Max ◽  
Growth Regulator ◽  
Insect Growth Regulator ◽  
Anticarsia Gemmatalis ◽  
Velvetbean Caterpillar ◽  
Insect Growth ◽  
Low Level ◽  
Glycine Max L ◽  
Soybean Leaves ◽  
Residual Control

Diflubenzuron [Dimilin™, N-[{(4-chlorophenyl)amino}carbonyl]-2-6-difluorobenzamide] is an insect growth regulator that is highly effective and provides residual control (up to 54 days) against velvetbean caterpillar, Anticarsia gemmatalis Hübner, on soybean, Glycine max (L.) Merrill, in Louisiana. We conducted a study to quantify the field persistence of diflubenzuron residues on soybean leaves when applied at 0.035 kg/ha, a rate used in preventive programs for velvetbean caterpillar. Day of application (day 0) concentration of the insecticide on the leaves was 206 ± 41 ng/cm2. By 14 days after treatment insecticide leaf coverage had decreased to about 20 ng/cm2, where it remained for the remainder of the study. This persistent low level residue on the soybean leaves is consistent with the extended diflubenzuron efficacy toward velvetbean caterpillar that has been documented in Louisiana.

IMPORTANCE OF SAMPLING NYMPHS IN THE EVALUATION OF INSECTICIDES FOR THREECORNERED ALFALFA HOPPER (HOMOPTERA: MEMBRACIDAE) CONTROL

1987 ◽  
Vol 22 (3) ◽  
pp. 253-263
Author(s):  
A. N. Sparks ◽  
D. J. Boethel
Keyword(s):  
Glycine Max ◽  
Growth Regulator ◽  
Residual Activity ◽  
Insect Growth Regulator ◽  
Test Results ◽  
Insecticide Efficacy ◽  
Glycine Max L ◽  
Spissistilus Festinus ◽  
Efficacy Studies ◽  
Complete Interpretation

Results of field insecticide efficacy studies for control of the threecornered alfalfa hopper, Spissistilus festinus (Say), in soybean, Glycine max (L.) Merrill, indicated that sampling of nymphs allows for a more complete interpretation of efficacy test results than sampling of adults alone. Sampling of nymphs not only allows detection of activity against nymphs, but because of their relative immobility, it also allows better destinction between reinfestation versus development of populations within plots and better evaluation of residual activity. Of the insecticides evaluated, four pyrethroids (asana, cyfluthrin, cyhalothrin, and fenvalerate) and an insect growth regulator (buprofezin) were found to provide the best control.

Susceptibility of the sheep body louse [Bovicola ovis (Schrank), Phthiraptera: Trichodectidae] to temephos and concentration stability during sheep dipping with a commercial temephos product

2012 ◽  
Vol 52 (12) ◽  
pp. 1131 ◽  
Author(s):  
Garry Levot
Keyword(s):  
Growth Regulator ◽  
Application Rate ◽  
Insect Growth Regulator ◽  
Cross Resistance ◽  
Product Label ◽  
Body Louse ◽  
Insect Growth ◽  
Low Level ◽  
Dipping Process ◽  
Laboratory Bioassays

Laboratory bioassays were used to measure the susceptibility of sheep lice [Bovicola ovis (Schrank)] strains that were resistant to pyrethroid or benzoylphenyl urea insect growth regulator insecticides to the organophosphate temephos, the most commonly used wet dipping insecticide. Compared with the reference susceptible strain, only the pyrethroid-resistant ‘Rowena’ strain displayed low level (2.2×) tolerance of temephos. Lice exposed to the minimum lethal concentration of temephos began to be affected within 6–7 h and all had responded to the insecticide within 24 h. In a dipping trial with sheep, the working concentration of temephos in a 5000-L plunge dip operating according to constant replenishment principles remained close to the nominal application rate of 350 mg/L. The ease with which temephos dip concentration was maintained simplified the dipping process. If typical of similar field populations, the absence, or low level of cross-resistance to temephos reported here for insect growth regulator-resistant and pyrethroid-resistant lice, respectively, should make wool producers confident that thorough dipping with temephos according to product label directions should be effective in controlling lice on their sheep.

Environmental degradation of the insect growth regulator methoprene

1975 ◽  
Vol 5 (3) ◽  
pp. 233-241 ◽  
Author(s):  
Gary B. Quistad ◽  
Luana E. Staiger ◽  
David A. Schooley
Keyword(s):  
Environmental Degradation ◽  
Growth Regulator ◽  
Insect Growth Regulator ◽  
Insect Growth

scholarly journals Efeitos do plantio direto e da consorciação soja-milho sobre inimigos naturais e pragas

2001 ◽  
Vol 36 (2) ◽  
pp. 235-241 ◽  
Author(s):  
Francisco Jorge Cividanes ◽  
José Carlos Barbosa
Keyword(s):  
Zea Mays ◽  
Glycine Max ◽  
Zea Mays L ◽  
Anticarsia Gemmatalis ◽  
Glycine Max L

Procurou-se avaliar os efeitos do plantio direto e da consorciação soja (Glycine max (L.) Merrill) e milho (Zea mays L.) sobre pragas e inimigos naturais. Os tratamentos constituíram um fatorial 3 x 2 (monocultura de soja, monocultura de milho, consorciação soja-milho x plantio direto, plantio convencional), em blocos casualizados. Os insetos foram amostrados pelo método do pano, rede entomológica, procura visual e armadilha de sucção. Entre os insetos-pragas do milho, Maecolaspis assimilis ocorreu em maior número no sistema de plantio convencional; o mesmo ocorreu com os predadores Cycloneda sanguinea e Doru sp. Por outro lado, M. assimilis e o predador Toxomerus sp. foram mais numerosos na monocultura de milho em relação à cultura do milho consorciado com soja. Dos insetos-pragas da soja, destacaram-se pelo maior número Anticarsia gemmatalis e Diabrotica gracilenta, no sistema de plantio convencional, e o mesmo aconteceu com a espécie da família Trichogrammatidae, enquanto as espécies da família Eulophidae foram mais numerosas na soja sob sistema de plantio direto. Na soja consorciada com milho foi maior o número de insetos-pragas Megalotomus sp. e Maecolaspis sp. e dos inimigos naturais Geocoris sp., Lebia concina, Orius sp., Braconidae e Scelionidae.

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