Library

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Entomopathogenic nematodes for biological control of the leafminer,Liriomyza trifolii (Dipt.: Agromyzidae) (1993)
    Springer
    BioControl 38 (1993), S. 359-369 
    Details
    ISSN: 1573-8248
    Keywords: Steinernema ; Heterorhabditis ; entomopathogen, r.h.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Description / Table of Contents: Résumé Au laboratoire, l'utilisation de 20 souches et/ou espèces de steinernematidés et d'hétérorhabditidés a conduit à un taux de mortalité de 48 à 98% chez des larves de la mineuseLiriomyza trifolii. En serre, l'abamectin a provoqué une meilleure limitation des larves deL. trifolii puisque ce taux atteignait les 100% comparativement à la souche All deSteinernema carpocapsae (24 à 43% de mortalité) ou de la souche deS. carpocapsae sélectionnée surLiriomyza (entre 8 et 44% de mortalité); l'humidité relative (H.R.) quotidienne était comprise entre 81 et 91% et celle minimale entre 50 et 70%. Dans la serre brumisée, sous H.R. élevée, la souche All disponible dans le commerce et l'isolat hawaïen de la souche MG-14 deS. feltiae (Filipjev) étaient responsables d'une mortalité moyenne de 69 et 67% respectivement. Il y avait une corrélation significative (P〈0,01) entre la mortalité des mineuses due aux nématodes et la H.R., y compris les déviations moyenne et standard et l'humidité relative minimale pendant les 48 h suivant le traitement. Une humidité relative supérieure à 92%, avec une déviation standard inférieure à 9% et un minimum de 72% provoquait des taux de 65% de mortalité chez les mineuses avec la souche All deS. carpocapsiae. L'obstacle principal à l'emploi des nématodes contre les mineuses est le faible taux d'humidité relative existant au niveau des feuilles. L'utilisation de nématodes contreL. trifolii peut être efficace si la H.R. reste élevée et si les nématodes pénètrent dans les galeries avant dessication; de plus les nématodes devraient être introduits conjointement à des insecticides chimiques tel l'abamectin pour pallier l'apparition éventuelle d'une résistance aux pesticides chezL. trifolii.
    Notes: Abstract In the laboratory, mortality rates of the agromyzid leafminer larvae,Liriomyza trifolii (Burgess), ranged from 48 to 98% by 20 strains and/or species of steinernematid and heterorhabditid nematodes. In the greenhouse, abamectin provided superior control of larval leafminers, killing 100% of them as compared withSteinernema carpocapsae (Weiser) All strain (24 to 43% leafminer mortality) orS. carpocapsae Liriomyza-selected strain (8 to 44% leafminer mortality); the maximum relative humidity (r.h.) ranged between 81 and 91% and the minimum r.h. between 50 and 70%. In the foghouse under high r.h., the commercially available All strain and the Hawaiian isolate ofS. feltiae (Filipjev) MG-14 strain caused 69 and 67% mean mortality, respectively. There was a significant correlation (P〈0.01) between nematode mortality of leafminers and r.h., including the mean, standard deviation, and minimum r.h. during the 48 h after treatment. Average r.h. 〉92% with a standard deviation of 〈9% r.h. and a minimum of 72% r.h. providedS. carpocapsae All strain mortality rates of leafminers 〉65%. The major constraint against the use of nematodes against leafminers in the foliar environment is low r.h. The use of nematodes againstL. trifolii can be successful if the r.h. remains high and if nematodes enter leafmines before desiccation, and the nematodes should be integrated with chemical insecticides such as abamectin to manage pesticide resistance inL. trifolii.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02374454
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Aggregation Pheromones of Two Geographical Isolates of the New Guinea Sugarcane Weevil, Rhabdoscelus obscurus (2000)
    Springer
    Journal of chemical ecology 26 (2000), S. 2763-2780 
    Details
    ISSN: 1573-1561
    Keywords: Aggregation pheromones ; Coleoptera ; Curculionidae ; cytochrome oxidase I ; 2-methyl-4-heptanol ; (E2)-6-methyl-2-hepten-4-ol ; 2-methyl-4octanol ; mitochondrial DNA ; New Guinea sugarcane weevil ; palm weevil ; Rhabdoscelus obscurus ; rhynchophorol ; sibling species ; sugarcane
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The aggregation pheromones were studied from two geographical isolates (Hakalau, Hawaii, and Silkwood, Queensland, Australia) of the New Guinea sugarcane weevil, Rhabdoscelus obscurus. Coupled gas chromatographic–electroantennographic detection (GC-EAD) and GC–mass spectrometric (MS) analyses of Porapak Q volatile extract from male and from female Hawaiian R. obscurus revealed a single EAD-active, male-specific candidate pheromone, which was identified as 2-methyl-4-octanol (1). Corresponding volatile analyses from male and from female Australian R. obscurus consistently revealed three EAD-active, male-specific candidate pheromone components that were identified as 1, (E2)-6-methyl-2-hepten-4-ol (rhynchophorol) (2), and 2-methyl-4-heptanol (3). In field experiment 1 in Hakalau, Hawaii, traps baited with a stereoisomeric mixture of synthetic 1 (3 mg/day) plus sugarcane captured more weevils than did traps baited with 1 or sugarcane alone or no bait, indicating that 1 is the pheromone of the Hawaiian R. obscurus population. In field experiment 2, conducted in Silkwood, Australia, traps baited with stereoisomeric mixtures of synthetic 1, 2, and 3 (3 mg/day each) plus sugarcane caught more weevils than did unbaited traps or traps baited with 1, 2, and 3 or sugarcane. Testing candidate pheromone components 1, 2, and 3 in experiments 2–5 in all possible binary, ternary, and quaternary combinations with sugarcane, indicated that 1 and 2 in combination, but not singly, are pheromone components of the Australian R. obscurus population. Weevils from several locations in Australia and Hawaii could not be differentiated using traditional morphological characters or ultrastructural comparisons with scanning electron microscopy (SEM). However, comparisons of mtDNA sequences (cytochrome oxidase I; regions I1 to M4; 201 base pairs) revealed 5.5% variation between the Hawaiian (N = 2) and the Australian (N = 4) samples. There was no intrapopulation variation in sequence data from the weevils from Hawaii versus Australia, suggesting that they are sibling species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1026437809875
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...