Field Experiments with Insecticides on Cotton for Control of the Boll Weevil, Bollworm, and Cotton Leafworm in 19611

1962 ◽  
Vol 55 (5) ◽  
pp. 688-692 ◽  
Author(s):  
J. W. Davis ◽  
C. B. Cowan ◽  
C. R. Parencia
Keyword(s):  
Field Experiments ◽  
Boll Weevil ◽  
Cotton Leafworm

Effectiveness of Several Insecticides against the Boll Weevil, Bollworm, and Cotton Leafworm

1958 ◽  
Vol 51 (6) ◽  
pp. 783-786 ◽  
Author(s):  
R. L. Walker ◽  
A. R. Hopkins ◽  
R. E. Fye
Keyword(s):  
Boll Weevil ◽  
Cotton Leafworm

Field Experiments with Several Insecticidal Sprays Against the Boll Weevil and Bollworm1

1960 ◽  
Vol 53 (5) ◽  
pp. 711-714 ◽  
Author(s):  
T. R. Pfrimmer ◽  
E. P. Lloyd ◽  
M. E. Merkl ◽  
R. E. Fuar
Keyword(s):  
Field Experiments ◽  
Boll Weevil

Enhancement of the efficiency of some insecticides against thrips and cotton leafworm by mineral oils

1985 ◽  
Vol 105 (1) ◽  
pp. 63-66 ◽  
Author(s):  
Omayma K. Moustafa ◽  
Z. M. El Attal
Keyword(s):  
Field Experiments ◽  
Mineral Oil ◽  
Cotton Leafworm ◽  
Mineral Oils ◽  
Paraffinic Oil

SUMMARYField experiments were carried out to study the effect of a highly purified paraffinic oil on the efficiency of some insecticidal sprays used for the control of thrips and cotton leafworm. The results show that the oil used separately at the rate of 7·51/ha significantly reduced the population of thrips, but oil-insecticide combinations were superior to oil or insecticides applied alone. The mineral oil increased the efficiency of candidate insecticides against both thrips and cotton leafworm two-fold or more.

Evaluation of Substitutes for DDT in Field Experiments for Control of the Bollworm and the Boll Weevil in Cotton: 1967-691234

1970 ◽  
Vol 63 (3) ◽  
pp. 848-850 ◽  
Author(s):  
A. R. Hopkins ◽  
H. M. Taft ◽  
W. James ◽  
C. E. Jfrnigan
Keyword(s):  
Field Experiments ◽  
Boll Weevil

scholarly journals Silica nanoparticles as pesticide against insects of different feeding types and their non-target attraction of predators

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Ahmed F. Thabet ◽  
Hessien A. Boraei ◽  
Ola A. Galal ◽  
Magdy F. M. El-Samahy ◽  
Kareem M. Mousa ◽  
...  
Keyword(s):  
Natural Enemies ◽  
Faba Bean ◽  
Field Experiments ◽  
Insect Pests ◽  
Germination Percentage ◽  
Choice Test ◽  
Rove Beetles ◽  
Cotton Leafworm ◽  
Growing Seasons ◽  
Serpentine Leafminer

AbstractThe agricultural use of silica (SiO2) nanoparticles (NPs) has the potential to control insect pests while the safety and tritrophic effects on plants and beneficial natural enemies remains unknown. Here, we evaluate the effects of silica NPs on insect pests with different feeding niches, natural enemies, and a plant. Silica NPs were applied at different concentrations (75–425 mg/L) on field-cultivated faba bean and soybean for two growing seasons. The faba bean pests, the cowpea aphid Aphis craccivora and the American serpentine leafminer Liriomyza trifolii, and the soybean pest, the cotton leafworm Spodoptera littoralis, were monitored along with their associated predators. Additional laboratory experiments were performed to test the effects of silica NPs on the growth of faba bean seedlings and to determine whether the rove beetle Paederus fuscipes is attracted to cotton leafworm-infested soybean treated with silica NPs. In the field experiments, silica NPs reduced the populations of all three insect pests and their associated predators, including rove beetles, as the concentration of silica NPs increased. In soybean fields, however, the total number of predators initially increased after applying the lowest concentration. An olfactometer-based choice test found that rove beetles were more likely to move towards an herbivore-infested plant treated with silica NPs than to a water-treated control, suggesting that silica NPs enhance the attraction of natural enemies via herbivore-induced plant volatiles. In the laboratory, while silica NPs inhibited the development of faba bean roots at 400 mg/L, they did not affect germination percentage, germination time, shoot length, or vigor index compared to the control.

Electron Microscopy of the Shape of Small Metal Particles

1977 ◽  
Vol 35 ◽  
pp. 300-301
Author(s):  
M. Jose Yacaman
Keyword(s):  
Electron Microscopy ◽  
Metal Particle ◽  
Field Experiments ◽  
Size Range ◽  
Dark Field ◽  
Metal Particles ◽  
Bragg Condition ◽  
Crystal Particle ◽  
Small Metal Particle ◽  
Small Metal Particles

In the Study of small metal particles the shape is a very Important parameter. Using electron microscopy Ino and Owaga(l) have studied the shape of twinned particles of gold. In that work electron diffraction and contrast (dark field) experiments were used to produce models of a crystal particle. In this work we report a method which can give direct information about the shape of an small metal particle in the amstrong- size range with high resolution. The diffraction pattern of a sample containing small metal particles contains in general several systematic and non- systematic reflections and a two-beam condition can not be used in practice. However a N-beam condition produces a reduced extinction distance. On the other hand if a beam is out of the bragg condition the effective extinction distance is even more reduced.

Successful field experiments: Getting in, getting the data, getting published

2010 ◽  
Author(s):  
Susan M. Kochanowski ◽  
Charles F. Seifert ◽  
Gary A. Yukl ◽  
Dov Eden ◽  
Gary P. Latham
Keyword(s):  
Field Experiments
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