A character for sexing live adults of Prostephanus truncatus (Horn) (Bostrichidae. Coleoptera)

Shires, S.W.; McCarthy, Shannen

doi:10.1016/0022-474x(76)90044-8

Cited by 46 publications

(14 citation statements)

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“…The sex of the P. truncatus adults used to infest the cobs was determined by carefully squeezing the abdomen of the beetles, which extrudes the genitals, since external sex determination (according to the method described by Shires & McCarthy, 1976) reaches only an accuracy level of about 90%. The sex of the P. truncatus adults used to infest the cobs was determined by carefully squeezing the abdomen of the beetles, which extrudes the genitals, since external sex determination (according to the method described by Shires & McCarthy, 1976) reaches only an accuracy level of about 90%.…”

Section: Methodsmentioning

confidence: 99%

“…Sexing method. The sex of the P. truncatus adults used to infest the cobs was determined by carefully squeezing the abdomen of the beetles, which extrudes the genitals, since external sex determination (according to the method described by Shires & McCarthy, 1976) reaches only an accuracy level of about 90%. The squeezing method was previously used in other experiments and showed no effect on behaviour or mat-ing capability (Scholz, unpubl.).…”

Section: Methodsmentioning

confidence: 99%

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Infestation of maize by Prostephanus truncatus initiated by male‐produced pheromone

Scholz¹,

Borgemeister²,

Meikle³

et al. 1997

Entomologia Exp Applicata

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Delta traps baited with maize cobs, which were infested each with one male Prostephanus truncatus (Horn) (Col.: Bostrichidae), were distributed in southern Benin and collected after one, two, three and four weeks. The numbers of P. truncatus caught during the different trapping periods were not significantly different. Sixty-four percent of the trapped P. truncatus were females. Females attracted during the one-week trapping period produced a mean of 6.9 progeny during the seven days. The sex ratio of the progeny was 1:1. Trap catches with the infested cobs were on average 13 times lower than catches with 2 mg of the artificial pheromone. Estimation of P. truncatus densities in a maize store at the beginning of the storage period (based on laboratory data) revealed that small initial numbers of P. truncatus, possibly attracted by a single male, sufficed to initiate high infestation rates later in the storage season.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Infestation of maize by Prostephanus truncatus initiated by male‐produced pheromone

Scholz¹,

Borgemeister²,

Meikle³

et al. 1997

Entomologia Exp Applicata

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“…There were 10 replicates of control and each treatment at each dose, in a fully randomised design. In order to investigate any possible sexual preference for the treatments, the beetles attracted to septa in 5 of the 5 mg tests of each treatment were sexed according to the method of Shires & McCarthy (1976).…”

Section: Methodsmentioning

confidence: 99%

RESPONSES OF PROSTEPHANUS TRUNCATUS TO COMPONENTS OF THE AGGREGATION PHEROMONE OF RHYZOPERTHA DOMINICA IN THE LABORATORY AND FIELD

Hodges¹,

Hall

Golob³

et al. 1983

Entomologia Exp Applicata

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Laboratory and field studies have been made of the responses of Prostephanus truncatus (Horn) to two components of the aggregation pheromone of Rhyzopertha dominica (Fabricius) — (±)‐1‐methylbutyl (E)‐2‐methyl‐2‐pentenoate and (±)‐1‐methylbutyl (E)‐2,4‐dimethyl‐2‐pentenoate, known as “Dominicalure 1” and “Dominicalure 2” respectively. In the laboratory, these compounds were tested individually and as a 1:2 mixture; P. truncatus responded most strongly to Dominicalure 2 alone. All three treatments were compared in a field trial in Tanzania to monitor both R. dominica and P. truncatus in farm stores. Dominicalure 1 or a mixture of 1 and 2 were both highly effective for trapping R. dominica. In contrast, Dominicalure 2 trapped more P. truncatus than the other treatments and was about as effective as visual inspection at demonstrating the presence of the beetle in stores. Dominicalure 2 could form the basis of a monitoring programme for P. truncatus in East Africa. RÉSUMÉ Réponses au laboratoire et dans les champs de Prostephanus truncatus aux constituants de la pheromone d'agrégation de Rhyzopertha dominica Les réponses de Prostephanus truncatus Horn (Coleoptera: Bostrichidae) à deux constituants de la pheromone d'agrégation de Rhyzopertha dominica Fabricius (Coleoptera: Bostrichidae), le (±)‐1‐méthylbutyl (E)‐2‐méthyl‐2‐penténoate et le (±)‐1‐méthylbutyl (E)‐2,4‐diméthyl‐2‐penténoate, connus comme “Dominicalure 1” et “Dominicalure 2”, ont été étudiées au laboratoire et au champ. Au laboratoire ces composés ont été essayés individuellement et en mélange 1:2. Une membrane de caoutchouc imprégnée de pheromone a été utilisée comme émetteur lent, et une courbe de réponse en fonction de la dose a été établie. P. truncatus répondait plus vigoureusement à la Dominicalure 2 seule. Tous ces traitements ont été comparés dans un essai aux champs en Tanzanie, dans lesquels des pièges en carton ondulé contenant des diffuseurs de pheromone étaient placés dans des entrepôts de maïs dans les fermes. La Dominicalure 1 et le mélange de 1 et 2 étaient tous deux efficaces pour piéger R. dominica. La Dominicalure 2 a piégé plus de P. truncatus que les autres traitements et était à peu près aussi efficace que le contrôle visuel pour détecter la présence de cet insecte dans les stocks. On peut envisager que la Dominicalure 2 pourrait servir de base à un programme pour lutter contre P. truncatus en Afrique de l'Est.

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“…In each glass jar, 3 male/female pairs (two days-old) of each species were placed. The LGB female stands out with the male by the high number of tubers on her head [29]. The MW female is distinguished from the male by its longer rostrum, smoother and more tapered [30].…”

Section: Interspecific Competition Testmentioning

confidence: 99%

Interspecific Competition and Grain-Hosts Selection of Maize Weevil, <i>Sitophilus zeamais</i> (Motsch.) (Coleoptera; Dryophtoridae) and Larger Grain Borer, <i>Prostephanus truncatus</i> (Horn) (Coleoptera; Bostrichidae)

Ngom¹,

Thiaw²,

Sembène³

2020

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Laboratory interspecific competition and grain-hosts selection experiments involving maize weevil (MW), Sitophilus zeamais (Motsch.) and larger grain borer (LGB), Prostephanus truncatus (Horn) were performed under ambient temperature and relative humidity (25˚C-35˚C and 70%-80% relative humidity) in their major host cereal, maize grains. The species reproductive rate and grain-hosts preference were evaluated by a number of emerged adults. In combined infestation, both species competed intensively by simultaneously increasing their individuals' emergence, 9-fold or greater than when reared alone. Even though both species simultaneously increased their progeny, S. zeamais was the dominant competitor and had a significant suppressant effect on P. truncatus. The selection result of grain-hosts showed that P. truncatus placed in the environment containing both uninfested maize grains and grains previously infested by S. zeamais, the insect prefers uninfested grains. Indeed, P. truncatus individuals' emergences were significantly more important to uninfested grains than to infested grains. The weevil-infested grains seemed to have deterrent and detrimental effects on P. truncatus. Conversely, S. zeamais selection of grain-hosts was significantly (P = 0.0001) more attracted by P. truncatus infested grains than to uninfested grains. Sitophilus zeamais individuals' emergences were significantly (P = 0.0008) more important to infested grains than to uninfested grains. The S. zeamais preference on grains previously infested would be stimulated by P. truncatus larval vibrations in grain. How to cite this paper: Ngom, D., Thiaw, C. and Sembène, M. (2020) Interspecific Competition and Grain-Hosts Selection of Maize Weevil, Sitophilus zeamais (Motsch.) (Coleoptera; Dryophtoridae) and Larger Grain Borer, Prostephanus truncatus (Horn) (Coleoptera; Bostrichidae). Advances in Entomology,

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A character for sexing live adults of Prostephanus truncatus (Horn) (Bostrichidae. Coleoptera)

Cited by 46 publications

References 1 publication

Infestation of maize by Prostephanus truncatus initiated by male‐produced pheromone

Infestation of maize by Prostephanus truncatus initiated by male‐produced pheromone

RESPONSES OF PROSTEPHANUS TRUNCATUS TO COMPONENTS OF THE AGGREGATION PHEROMONE OF RHYZOPERTHA DOMINICA IN THE LABORATORY AND FIELD

Interspecific Competition and Grain-Hosts Selection of Maize Weevil, <i>Sitophilus zeamais</i> (Motsch.) (Coleoptera; Dryophtoridae) and Larger Grain Borer, <i>Prostephanus truncatus</i> (Horn) (Coleoptera; Bostrichidae)

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A character for sexing live adults of Prostephanus truncatus (Horn) (Bostrichidae. Coleoptera)

Cited by 46 publications

References 1 publication

Infestation of maize by Prostephanus truncatus initiated by male‐produced pheromone

Infestation of maize by Prostephanus truncatus initiated by male‐produced pheromone

RESPONSES OF PROSTEPHANUS TRUNCATUS TO COMPONENTS OF THE AGGREGATION PHEROMONE OF RHYZOPERTHA DOMINICA IN THE LABORATORY AND FIELD

Interspecific Competition and Grain-Hosts Selection of Maize Weevil, &lt;i&gt;Sitophilus zeamais&lt;/i&gt; (Motsch.) (Coleoptera; Dryophtoridae) and Larger Grain Borer, &lt;i&gt;Prostephanus truncatus&lt;/i&gt; (Horn) (Coleoptera; Bostrichidae)

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Interspecific Competition and Grain-Hosts Selection of Maize Weevil, <i>Sitophilus zeamais</i> (Motsch.) (Coleoptera; Dryophtoridae) and Larger Grain Borer, <i>Prostephanus truncatus</i> (Horn) (Coleoptera; Bostrichidae)