Plutella xylostella (diamondback moth) and its parasitoid Diadegma semiclausum show different gustatory and longevity responses to a range of nectar and honeydew sugars

2005 ◽  
Vol 115 (1) ◽  
pp. 187-192 ◽  
Author(s):  
Karin Winkler ◽  
Felix L. Wäckers ◽  
Attila Stingli ◽  
Joop C. Van Lenteren
Keyword(s):  
Plutella Xylostella ◽  
Diamondback Moth ◽  
Diadegma Semiclausum

scholarly journals Development and reproduction of Diadegma semiclausum (Hymenoptera Ichneumonidae) on diamondback moth Plutella xylostella (Lepidotera Plutellidae)

2008 ◽  
Vol 61 ◽  
pp. 322-327 ◽  
Author(s):  
D. Khatri ◽  
Q. Wang ◽  
X.Z. He
Keyword(s):  
Plutella Xylostella ◽  
Diamondback Moth ◽  
Developmental Period ◽  
Fourth Instar ◽  
Pupal Weight ◽  
Diadegma Semiclausum

This study investigated the development emergence and mating of Diadegma semiclausum Hellen an important parasitoid of diamondback moth in the laboratory at 21 1C and 5060 RH with a photoperiod of 1212 h (lightdark) The parasitoids developmental period was significantly shorter and pupal weight significantly higher if their mothers parasitised the fourth instar larvae of DBM (P

scholarly journals Mating behaviour and egg maturation in Diadegma semiclausum Hellen (Hymenoptera Ichneumonidae)

2009 ◽  
Vol 62 ◽  
pp. 174-178
Author(s):  
D. Khatri ◽  
X.Z. He ◽  
Q. Wang
Keyword(s):  
Reproductive Biology ◽  
Plutella Xylostella ◽  
Mating Behaviour ◽  
Diamondback Moth ◽  
Diadegma Semiclausum ◽  
Larval Parasitoid ◽  
Egg Maturation ◽  
Males And Females ◽  
Sexually Mature

Diadegma semiclausum is an important larval parasitoid of diamondback moth Plutella xylostella Little was known about the reproductive biology of this parasitoid The present study investigated mating behaviour and egg maturation dynamics of D semiclausum in the laboratory at 211C 168 h (lightdark) and 5060 RH Both males and females became sexually mature

scholarly journals Detection of parasitism in diamondback moth, Plutella xylostella (L.), using differential melanization and coagulation reactions

2007 ◽  
Vol 97 (4) ◽  
pp. 399-405 ◽  
Author(s):  
D. Li ◽  
N. Schellhorn ◽  
O. Schmidt
Keyword(s):  
Decision Making ◽  
Pest Control ◽  
Plutella Xylostella ◽  
Diamondback Moth ◽  
Diagnostic Tools ◽  
Gut Content ◽  
Diadegma Semiclausum ◽  
Western Blots ◽  
Control Decision

AbstractDiamondback moth (DBM), Plutella xylostella, is known for causing damage to Brassica crops and developing resistance to chemical and biological pesticides; it has become one of the most difficult pests to manage in many regions around the world. The only way to reduce reliance on pesticides is to maximize the role of natural control agents for integrated pest management programs and be able to incorporate the mortality from control agents into pest control decision-making. More than 90 hymenopterous parasitoids are associated with DBM worldwide; among them, Diadegma semiclausum, is a major endoparasitoid of P. xylostella. To optimize parasitism of pests in pest control decision-making, it is necessary to develop rapid and simple methods for distinguishing parasitized from non-parasitized larvae in the field. Here we report on a number of diagnostic tools to identify parasitized larvae. One is based on differential melanization reactions in hemolymph due to immune suppression in parasitized larvae. The lack of coagulation reactions in hemolymph provides a simple initial test, where squashing a non-parasitized larva onto nitrocellulose membrane traps chlorophyll-containing gut content on the membrane leaving a green dot of clotted gut material. However, in immune-suppressed parasitized larvae, the gut content was washed away in absence of coagulation reactions and the membrane lacks a green dot. This tool alone or combined with others, allows quick detection of parasitized caterpillars in the field. We further showed that the antibody MAb 9A5 can be used to detect D. semiclausum parasitized larvae of DBM in Western blots.

Spread and global population structure of the diamondback moth Plutella xylostella (Lepidoptera: Plutellidae) and its larval parasitoids Diadegma semiclausum and Diadegma fenestrale (Hymenoptera: Ichneumonidae) based on mtDNA

2016 ◽  
Vol 107 (2) ◽  
pp. 155-164 ◽  
Author(s):  
I. Juric ◽  
W. Salzburger ◽  
O. Balmer
Keyword(s):  
Population Structure ◽  
Genetic Variability ◽  
Dna Sequences ◽  
Plutella Xylostella ◽  
Diamondback Moth ◽  
Parasitic Wasps ◽  
Diadegma Semiclausum ◽  
Wasp Species ◽  
Wide Range ◽  
Diadegma Fenestrale

AbstractThe diamondback moth (DBM) (Plutella xylostella) is one of the main pests of brassicaceous crops worldwide and shows resistance against a wide range of synthetic insecticides incurring millions of dollars in control costs every year. The DBM is a prime example of the introduction of an exotic species as a consequence of globalization. In this study we analyzed the genetic population structure of the DBM and two of its parasitic wasps, Diadegma semiclausum and Diadegma fenestrale, based on mitochondrial DNA sequences. We analyzed DBM samples from 13 regions worldwide (n = 278), and samples of the two wasp species from six European and African countries (n = 131), in an attempt to reconstruct the geographic origin and phylogeography of the DBM and its two parasitic wasps. We found high variability in COI sequences in the diamondback moth. Haplotype analysis showed three distinct genetic clusters, one of which could represent a cryptic species. Mismatch analysis confirmed the hypothesized recent spread of diamondback moths in North America, Australia and New Zealand. The highest genetic variability was found in African DBM samples. Our data corroborate prior claims of Africa as the most probable origin of the species but cannot preclude Asia as an alternative. No genetic variability was found in the two Diadegma species. The lack of variability in both wasp species suggests a very recent spread of bottlenecked populations, possibly facilitated by their use as biocontrol agents. Our data thus also contain no signals of host-parasitoid co-evolution.

scholarly journals Reproductive fitness of Diadegma semiclausum Hellen (Hymenoptera Ichneumonidae) in response to host density

2012 ◽  
Vol 65 ◽  
pp. 142-147
Author(s):  
D. Khatri ◽  
X.Z. He ◽  
Q. Wang
Keyword(s):  
Plutella Xylostella ◽  
Diamondback Moth ◽  
Host Density ◽  
Reproductive Fitness ◽  
Diadegma Semiclausum ◽  
Female Progeny ◽  
Larval Parasitoid

Diadegma semiclausum is an important larval parasitoid of diamondback moth (DBM) Plutella xylostella The present study investigated the reproductive fitness of D semiclausum females in response to host densities of 5 and 30 DBM larvae per cabbage seedling per day Both the number of hosts parasitised and the number of female progeny produced over the life of the parasitoid were significantly greater in the 30 than the 5 host density (hosts parasitised 60131 versus 12015 and female progeny produced 6710 versus 122) (P

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