Experiments on the Relation Between the Location of Cotton Fields and the Intensity of Boll Weevil Infestation the Succeeding Season

1929 ◽  
Vol 22 (5) ◽  
pp. 750-756 ◽  
Author(s):  
E. W. Dunnam
Keyword(s):  
Boll Weevil ◽  
Cotton Fields ◽  
Weevil Infestation

Survival and behavioural responses of the predatory ladybird beetle, Eriopis connexa populations susceptible and resistant to a pyrethroid insecticide

2013 ◽  
Vol 103 (4) ◽  
pp. 485-494 ◽  
Author(s):  
A.F. Spíndola ◽  
C.S.A. Silva-Torres ◽  
A.R.S. Rodrigues ◽  
J.B. Torres
Keyword(s):  
Boll Weevil ◽  
Pyrethroid Insecticide ◽  
Anthonomus Grandis ◽  
Plant Canopy ◽  
Ladybird Beetle ◽  
Behavioural Responses ◽  
Ladybird Beetles ◽  
Resistant Population ◽  
Eriopis Connexa ◽  
Cotton Fields

AbstractThe ladybird beetle, Eriopis connexa (Germar) (Coleoptera: Coccinellidae), is one of the commonest predators of aphids (Hemiptera: Aphididae) in the cotton agroecosystem and in many other row and fruit crops in Brazil, and has been introduced into other countries such as the USA for purposes of aphid control. In addition, the boll weevil, Anthonomus grandis Boheman (Coleoptera: Curculionidae) is the most serious cotton pest where it occurs, including Brazil. Controlling boll weevils and other pests such as cotton defoliators still tends to involve the intense application of insecticides to secure cotton production. The pyrethroid insecticide lambda-cyhalothrin (LCT) is commonly used, but this compound is not effective against aphids; hence, a desirable strategy would be to maintain E. connexa populations in cotton fields where LCT is applied. Using populations of E. connexa resistant (Res) and susceptible (Sus) to LCT, we compared behavioural responses on treated cotton plants and under confinement on partially and fully treated surfaces, and assessed the insects' survival on treated plants compared with that of the boll weevil. The E. connexa resistant population caged on treated plants with 15 and 75 g a.i. ha−1 exhibited ≫82% survival for both insecticide concentrations compared with ≪3% and ≪17% survival for susceptible E. connexa populations and boll weevils, respectively. The response of E. connexa Res and Sus populations when released, either on the soil or on the plant canopy, indicated avoidance towards treated plants, as measured by elapsed time to assess the plant. When compared with susceptible individuals, resistant ones took longer time to suffer insecticide knockdown, had a higher recovery rate after suffering knockdown, and spent more time in the plant canopy. Based on behavioural parameters evaluated in treated arenas, no ladybird beetles exhibited repellency. However, irritability was evident, with the susceptible population exhibiting greater irritability compared with the resistant population and a subgroup comprising resistant individuals that had recovered from knockdown. The outcomes for the E. connexa Res population indicate a promising strategy for its maintenance when using the insecticide LCT in integrated pest management schemes to control boll weevil or other non-target pest of ladybird beetles in cotton fields.

Colonization and Spatial Distribution of Boll Weevil in Commercial Cotton Fields

2020 ◽  
Vol 49 (6) ◽  
pp. 901-915
Author(s):  
L S Arruda ◽  
G G Rolim ◽  
E M Barros ◽  
F F Pereira ◽  
J B Torres
Keyword(s):  
Spatial Distribution ◽  
Boll Weevil ◽  
Cotton Fields

scholarly journals Tenancy, Marriage, and the Boll Weevil Infestation, 1892–1930

Demography ◽  
2017 ◽  
Vol 54 (3) ◽  
pp. 1029-1049 ◽  
Author(s):  
Deirdre Bloome ◽  
James Feigenbaum ◽  
Christopher Muller
Keyword(s):  
Boll Weevil ◽  
Weevil Infestation

Effect of Sterile Boll Weevils (Coleoptera: Curculionidae) and Insecticide in Isolated Small Plots in Florida

1992 ◽  
Vol 27 (2) ◽  
pp. 120-125
Author(s):  
E. J. Villavaso ◽  
W. L. McGovern ◽  
J. L. Roberson ◽  
J. W. Smith ◽  
H. W. Ray ◽  
...  
Keyword(s):  
Treatment Period ◽  
Growing Season ◽  
Boll Weevil ◽  
Reproductive Activity ◽  
Anthonomus Grandis ◽  
Pheromone Traps ◽  
Egg Hatch ◽  
Baited Traps ◽  
Private Research ◽  
Cotton Fields

In the spring and summer of 1989, insecticide and sterile boll weevils, Anthonomus grandis Boheman, were applied to plots of cotton on two private research farms at Vero Beach, Florida to suppress the native boll weevil population. Plots were treated weekly with azinphosmethyl followed by the release of about 500 sterile boll weevils per acre two days later. Egg hatch was 5% on the Mobay farm where serially planted plots of cotton were destroyed soon after blooming. On the Ciba-Geigy farm egg hatch averaged 32% prior to the formation of bolls 2.5 cm (1 in.) or larger in diameter and 77% when bolls were larger than 2.5 cm in diameter. Normally, egg hatch in fields with no sterile weevils is about 94% so their effect in preventing or significantly lowering the reproductive activity of native females entering the cotton fields was demonstrated. After natives began emerging from the clumped areas where oviposition had taken place, the effectiveness of the sterile weevils was significantly diminished. The Ciba-Geigy research farm had received more than 30 applications of azinphosmethyl during the 1988 growing season, and the Mobay farm had received 6 applications of methomyl. In 1989, 16 pheromone baited traps placed around the perimeter of each farm in 1989 captured an average of 12 (Mobay) and 37 (Ciba-Geigy native weevils per week before and during the treatment period. At Ciba-Geigy 41% of the trapped weevils were sterile compared to 34% at Mobay. In 1990, 16 pheromone traps placed around the Mobay and Ciba-Geigy farms averaged 0 and 4 weevils per week, respectively, during the growing season.

scholarly journals Population structure of the boll weevil in cotton fields and subtropical forests of South America: a bayesian approach

Genetica ◽  
2006 ◽  
Vol 131 (1) ◽  
pp. 11-20 ◽  
Author(s):  
N. V. Guzmán ◽  
V. V. Lia ◽  
A. A. Lanteri ◽  
V. A. Confalonieri
Keyword(s):  
Population Structure ◽  
South America ◽  
Bayesian Approach ◽  
Boll Weevil ◽  
Subtropical Forests ◽  
Cotton Fields

Genetic Resistance to Boll Weevil Oviposition in Primitive Cotton 1

Crop Science ◽  
1987 ◽  
Vol 27 (2) ◽  
pp. 263-264 ◽  
Author(s):  
J. C. McCarty ◽  
J. N. Jenkins ◽  
W. L. Parrott
Keyword(s):  
Genetic Resistance ◽  
Boll Weevil
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