Independent and Combined Effects of Bacillus thuringiensis and the Parasitoid Cotesia plutellae (Hymenoptera

Braconidae) on Susceptible and Resistant Diamondback Moth (Lepidoptera: Plutellidae)

Charles F. Chilcutt, Bruce E Tabashnik

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

We evaluated mortality to larvae of diamondback moth, Plutella xylostella (L.), caused by the microbial pathogen Bacillus thuringiensis Berliner and the endoparasitic wasp Cotesia plutellae Kurdjumov, separately and in combination. Each of 3 colonies of diamondback moth (susceptible, moderately resistant, and highly resistant to B. thuringiensis) received the following 4 treatments: (1) control, (2) B. thuringiensis only, (3) parasitoids only, and (4) B. thuringiensis plus parasitoids. With increasing colony resistance, the effect of B. thuringiensis decreased but the effect of parasitoids remained the same. The effect of B. thuringiensis plus parasitoids depended on the susceptibility of the host to B. thuringiensis. For the susceptible colony, highest diamondback moth mortality was caused by B. thuringiensis plus parasitoids, but for the 2 resistant colonies, parasitoids alone caused as much mortality as B. thuringiensis and parasitoids combined. For the susceptible and highly resistant colonies, we also evaluated the effect of varying the time interval between parasitism by C. plutellae and exposure to B. thuringiensis on diamondback moth mortality and C. plutellae survival. For the susceptible colony, diamondback moth mortality and C. plutellae survival did not vary as a function of the time interval between parasitism and exposure to B. thuringiensis. For the resistant colony, delaying B. thuringiensis treatment from 0 to 4 d after parasitism occurred did not affect diamondback moth mortality, but it significantly increased parasitoid survival. Efforts to integrate B. thuringiensis and C. plutellae must consider mortality of immature parasitoids inside of susceptible hosts.

Original languageEnglish (US)
Pages (from-to)397-403
Number of pages7
JournalJournal of Economic Entomology
Volume90
Issue number2
StatePublished - Apr 1997

Fingerprint

Cotesia plutellae
Plutellidae
Plutella xylostella
Braconidae
parasitoid
Bacillus thuringiensis
moth
Hymenoptera
Lepidoptera
mortality
parasitoids
parasitism
effect
wasp
pathogen
larva

Keywords

  • Bacillus thuringiensis
  • Biological control
  • Cotesia plutellae
  • Integrated pest management
  • Pesticide resistance
  • Plutella xylostella

ASJC Scopus subject areas

  • Insect Science

Cite this

@article{001c26f1f0b04ed2808bed8ee37c5eca,
title = "Independent and Combined Effects of Bacillus thuringiensis and the Parasitoid Cotesia plutellae (Hymenoptera: Braconidae) on Susceptible and Resistant Diamondback Moth (Lepidoptera: Plutellidae)",
abstract = "We evaluated mortality to larvae of diamondback moth, Plutella xylostella (L.), caused by the microbial pathogen Bacillus thuringiensis Berliner and the endoparasitic wasp Cotesia plutellae Kurdjumov, separately and in combination. Each of 3 colonies of diamondback moth (susceptible, moderately resistant, and highly resistant to B. thuringiensis) received the following 4 treatments: (1) control, (2) B. thuringiensis only, (3) parasitoids only, and (4) B. thuringiensis plus parasitoids. With increasing colony resistance, the effect of B. thuringiensis decreased but the effect of parasitoids remained the same. The effect of B. thuringiensis plus parasitoids depended on the susceptibility of the host to B. thuringiensis. For the susceptible colony, highest diamondback moth mortality was caused by B. thuringiensis plus parasitoids, but for the 2 resistant colonies, parasitoids alone caused as much mortality as B. thuringiensis and parasitoids combined. For the susceptible and highly resistant colonies, we also evaluated the effect of varying the time interval between parasitism by C. plutellae and exposure to B. thuringiensis on diamondback moth mortality and C. plutellae survival. For the susceptible colony, diamondback moth mortality and C. plutellae survival did not vary as a function of the time interval between parasitism and exposure to B. thuringiensis. For the resistant colony, delaying B. thuringiensis treatment from 0 to 4 d after parasitism occurred did not affect diamondback moth mortality, but it significantly increased parasitoid survival. Efforts to integrate B. thuringiensis and C. plutellae must consider mortality of immature parasitoids inside of susceptible hosts.",
keywords = "Bacillus thuringiensis, Biological control, Cotesia plutellae, Integrated pest management, Pesticide resistance, Plutella xylostella",
author = "Chilcutt, {Charles F.} and Tabashnik, {Bruce E}",
year = "1997",
month = "4",
language = "English (US)",
volume = "90",
pages = "397--403",
journal = "Journal of Economic Entomology",
issn = "0022-0493",
publisher = "Entomological Society of America",
number = "2",

}

TY - JOUR

T1 - Independent and Combined Effects of Bacillus thuringiensis and the Parasitoid Cotesia plutellae (Hymenoptera

T2 - Braconidae) on Susceptible and Resistant Diamondback Moth (Lepidoptera: Plutellidae)

AU - Chilcutt, Charles F.

AU - Tabashnik, Bruce E

PY - 1997/4

Y1 - 1997/4

N2 - We evaluated mortality to larvae of diamondback moth, Plutella xylostella (L.), caused by the microbial pathogen Bacillus thuringiensis Berliner and the endoparasitic wasp Cotesia plutellae Kurdjumov, separately and in combination. Each of 3 colonies of diamondback moth (susceptible, moderately resistant, and highly resistant to B. thuringiensis) received the following 4 treatments: (1) control, (2) B. thuringiensis only, (3) parasitoids only, and (4) B. thuringiensis plus parasitoids. With increasing colony resistance, the effect of B. thuringiensis decreased but the effect of parasitoids remained the same. The effect of B. thuringiensis plus parasitoids depended on the susceptibility of the host to B. thuringiensis. For the susceptible colony, highest diamondback moth mortality was caused by B. thuringiensis plus parasitoids, but for the 2 resistant colonies, parasitoids alone caused as much mortality as B. thuringiensis and parasitoids combined. For the susceptible and highly resistant colonies, we also evaluated the effect of varying the time interval between parasitism by C. plutellae and exposure to B. thuringiensis on diamondback moth mortality and C. plutellae survival. For the susceptible colony, diamondback moth mortality and C. plutellae survival did not vary as a function of the time interval between parasitism and exposure to B. thuringiensis. For the resistant colony, delaying B. thuringiensis treatment from 0 to 4 d after parasitism occurred did not affect diamondback moth mortality, but it significantly increased parasitoid survival. Efforts to integrate B. thuringiensis and C. plutellae must consider mortality of immature parasitoids inside of susceptible hosts.

AB - We evaluated mortality to larvae of diamondback moth, Plutella xylostella (L.), caused by the microbial pathogen Bacillus thuringiensis Berliner and the endoparasitic wasp Cotesia plutellae Kurdjumov, separately and in combination. Each of 3 colonies of diamondback moth (susceptible, moderately resistant, and highly resistant to B. thuringiensis) received the following 4 treatments: (1) control, (2) B. thuringiensis only, (3) parasitoids only, and (4) B. thuringiensis plus parasitoids. With increasing colony resistance, the effect of B. thuringiensis decreased but the effect of parasitoids remained the same. The effect of B. thuringiensis plus parasitoids depended on the susceptibility of the host to B. thuringiensis. For the susceptible colony, highest diamondback moth mortality was caused by B. thuringiensis plus parasitoids, but for the 2 resistant colonies, parasitoids alone caused as much mortality as B. thuringiensis and parasitoids combined. For the susceptible and highly resistant colonies, we also evaluated the effect of varying the time interval between parasitism by C. plutellae and exposure to B. thuringiensis on diamondback moth mortality and C. plutellae survival. For the susceptible colony, diamondback moth mortality and C. plutellae survival did not vary as a function of the time interval between parasitism and exposure to B. thuringiensis. For the resistant colony, delaying B. thuringiensis treatment from 0 to 4 d after parasitism occurred did not affect diamondback moth mortality, but it significantly increased parasitoid survival. Efforts to integrate B. thuringiensis and C. plutellae must consider mortality of immature parasitoids inside of susceptible hosts.

KW - Bacillus thuringiensis

KW - Biological control

KW - Cotesia plutellae

KW - Integrated pest management

KW - Pesticide resistance

KW - Plutella xylostella

UR - http://www.scopus.com/inward/record.url?scp=0001100571&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0001100571&partnerID=8YFLogxK

M3 - Article

VL - 90

SP - 397

EP - 403

JO - Journal of Economic Entomology

JF - Journal of Economic Entomology

SN - 0022-0493

IS - 2

ER -