External rostral characters for differentiation of sexes in the biological control agent Mecinus janthinus (Coleoptera: Curculionidae)

2007 ◽  
Vol 139 (3) ◽  
pp. 354-357 ◽  
Author(s):  
Marjolein Schat ◽  
Sharlene E. Sing ◽  
Robert K.D. Peterson
Keyword(s):  
Biological Control ◽  
Biological Control Agent ◽  
Sex Differentiation ◽  
Classical Biological Control ◽  
Control Agent ◽  
Invasive Weed ◽  
Linaria Dalmatica ◽  
Mecinus Janthinus ◽  
Exotic Invasive ◽  
Dalmatian Toadflax

AbstractThe stem-boring weevil, Mecinus janthinus (Germar), is a promising, well established classical biological control agent for the exotic invasive weed Dalmatian toadflax (Linaria dalmatica (L.) Mill.) (Scrophulariaceae). In this paper we present readily apparent rostral characters that can be used for sex differentiation of live stem-boring weevils at low magnification. These characters can be used by workers with little training to accurately sex weevils and can be used to rapidly determine sex ratios of field populations to improve timing of collection for redistribution.

scholarly journals Erratum: External rostral characters for differentiation of sexes in the biological control agent Mecinus janthinus (Coleoptera: Curculionidae)

2007 ◽  
Vol 139 (5) ◽  
pp. 756-756
Author(s):  
Marjolein Schat ◽  
Sharlene E. Sing ◽  
Robert K.D. Peterson
Keyword(s):  
Biological Control ◽  
Lutte Biologique ◽  
Biological Control Agent ◽  
Control Agent ◽  
Linaria Dalmatica ◽  
Mecinus Janthinus ◽  
Lutte Biologique Classique

RésuméLe charançon perceur de tiges, Mecinus janthinus (Germar), est un agent de lutte biologique classique bien établi et prometteur pour le contrôle d'une mauvaise herbe exotique invasive, la linaire à feuilles larges (Linaria dalmatica (L.) Mill.) (Scrophulariaceae). Dans cet article, nous présentons des caractéristiques du rostre faciles à identifier, permettant la différenciation, à faible grossissement, des sexes de charançons perceurs de tiges vivants. Ces caractéristiques peuvent être utilisées par des travailleurs possédant une formation minimale afin d'identifier correctement le sexe des charançons. Ceci permettra donc une détermination rapide de la proportion des sexes des populations sur le terrain, améliorant ainsi les délais de capture, puis de lâchers.

scholarly journals Limited host range in the idiobiont parasitoid Phymasticus coffea, a prospective biological control agent of the coffee pest Hypothenemus hampei in Hawaii

2021 ◽  
Author(s):  
Fazila Yousuf ◽  
Peter A. Follett ◽  
Conrad P. D. T. Gillett ◽  
David Honsberger ◽  
Lourdes Chamorro ◽  
...  
Keyword(s):  
Biological Control ◽  
Native Species ◽  
Biological Control Agent ◽  
Classical Biological Control ◽  
Environmental Safety ◽  
Control Agent ◽  
Hypothenemus Hampei ◽  
Parasitism Rate ◽  
Limited Host Range ◽  
Parasitoid Development

AbstractPhymastichus coffea LaSalle (Hymenoptera:Eulophidae) is an adult endoparasitoid of the coffee berry borer, Hypothenemus hampei (Ferrari) (Coleoptera:Curculionidae:Scolytinae), which has been introduced in many coffee producing countries as a biological control agent. To determine the effectiveness of P. coffea against H. hampei and environmental safety for release in Hawaii, we investigated the host selection and parasitism response of adult females to 43 different species of Coleoptera, including 23 Scolytinae (six Hypothenemus species and 17 others), and four additional Curculionidae. Non-target testing included Hawaiian endemic, exotic and beneficial coleopteran species. Using a no-choice laboratory bioassay, we demonstrated that P. coffea was only able to parasitize the target host H. hampei and four other adventive species of Hypothenemus: H. obscurus, H. seriatus, H. birmanus and H. crudiae. Hypothenemus hampei had the highest parasitism rate and shortest parasitoid development time of the five parasitized Hypothenemus spp. Parasitism and parasitoid emergence decreased with decreasing phylogenetic relatedness of the Hypothenemus spp. to H. hampei, and the most distantly related species, H. eruditus, was not parasitized. These results suggest that the risk of harmful non-target impacts is low because there are no native species of Hypothenemus in Hawaii, and P. coffea could be safely introduced for classical biological control of H. hampei in Hawaii.

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