Effect of formulation and application method on the efficacy of aerial and submerged conidia of metarhizium flavoviride for locust and grasshopper control

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

A study was carried out to investigate the relative infectivity of aerial and submerged conidia of Metarhizium flavoviride to Schistocerca gregaria and Zonocenis variegatus. The effect of formulation and application method on initial infectivity and field persistence of these conidia was investigated. Strain IMI 330189 was highly virulent to S. gregaria but showed relatively low virulence to Z. variegatus. Direct contact with conidia from the initial spray application resulted in 100% mortality of S. gregaria for all formulation and application combinations. The mean survival time of infected locusts was significantly shorter for treatments using a knapsack sprayer containing submerged conidia in water plus 10 ml litre-1 'Codacide'® (seven days), than treatments with aerial conidia in oil using ULV techniques (8.9 days) or submerged conidia in modified (water plus adjuvants) ULV (MULV) (nine days) or in water-based (VLV) applications (9-3 days). Both aerial and submerged conidia persisted long enough in the environment to effect significant mortality via secondary pick-up of spray residue from vegetation. Persistence was greatest in the ULV and MULV treatments, where the oil component of the formulations provided greater protection of the conidia from environmental stresses. The consequences of secondary pick-up of conidia from the different treatments on total mortality from a single application were examined using a simple host-pathogen model. This predicted that the ULV treatment would be much more effective than the other treatments under conditions where direct contact with the spray was limited. The results of these investigations are discussed in the context of development of optimum spray strategies for control of locusts and grasshoppers, and other pests, under different environmental conditions.

Original languageEnglish (US)
Pages (from-to)299-306
Number of pages8
JournalPesticide Science
Volume46
Issue number4
DOIs
StatePublished - Jan 1 1996

Fingerprint

Metarhizium flavoviride
Metarhizium
Grasshoppers
Fungal Spores
locusts
grasshoppers
application methods
conidia
Schistocerca gregaria
direct contact
Mortality
Water
Oils
pathogenicity
knapsack sprayers
oils
water
Conservation of Natural Resources
adjuvants
Virulence

All Science Journal Classification (ASJC) codes

  • Applied Microbiology and Biotechnology

Cite this

@article{2c1363062a9148628b999278460fcfec,
title = "Effect of formulation and application method on the efficacy of aerial and submerged conidia of metarhizium flavoviride for locust and grasshopper control",
abstract = "A study was carried out to investigate the relative infectivity of aerial and submerged conidia of Metarhizium flavoviride to Schistocerca gregaria and Zonocenis variegatus. The effect of formulation and application method on initial infectivity and field persistence of these conidia was investigated. Strain IMI 330189 was highly virulent to S. gregaria but showed relatively low virulence to Z. variegatus. Direct contact with conidia from the initial spray application resulted in 100{\%} mortality of S. gregaria for all formulation and application combinations. The mean survival time of infected locusts was significantly shorter for treatments using a knapsack sprayer containing submerged conidia in water plus 10 ml litre-1 'Codacide'{\circledR} (seven days), than treatments with aerial conidia in oil using ULV techniques (8.9 days) or submerged conidia in modified (water plus adjuvants) ULV (MULV) (nine days) or in water-based (VLV) applications (9-3 days). Both aerial and submerged conidia persisted long enough in the environment to effect significant mortality via secondary pick-up of spray residue from vegetation. Persistence was greatest in the ULV and MULV treatments, where the oil component of the formulations provided greater protection of the conidia from environmental stresses. The consequences of secondary pick-up of conidia from the different treatments on total mortality from a single application were examined using a simple host-pathogen model. This predicted that the ULV treatment would be much more effective than the other treatments under conditions where direct contact with the spray was limited. The results of these investigations are discussed in the context of development of optimum spray strategies for control of locusts and grasshoppers, and other pests, under different environmental conditions.",
author = "Jenkins, {Nina Ellen}",
year = "1996",
month = "1",
day = "1",
doi = "10.1002/(SICI)1096-9063(199604)46:4<299::AID-PS362>3.0.CO;2-L",
language = "English (US)",
volume = "46",
pages = "299--306",
journal = "Pest Management Science",
issn = "1526-498X",
publisher = "John Wiley and Sons Ltd",
number = "4",

}

TY - JOUR

T1 - Effect of formulation and application method on the efficacy of aerial and submerged conidia of metarhizium flavoviride for locust and grasshopper control

AU - Jenkins, Nina Ellen

PY - 1996/1/1

Y1 - 1996/1/1

N2 - A study was carried out to investigate the relative infectivity of aerial and submerged conidia of Metarhizium flavoviride to Schistocerca gregaria and Zonocenis variegatus. The effect of formulation and application method on initial infectivity and field persistence of these conidia was investigated. Strain IMI 330189 was highly virulent to S. gregaria but showed relatively low virulence to Z. variegatus. Direct contact with conidia from the initial spray application resulted in 100% mortality of S. gregaria for all formulation and application combinations. The mean survival time of infected locusts was significantly shorter for treatments using a knapsack sprayer containing submerged conidia in water plus 10 ml litre-1 'Codacide'® (seven days), than treatments with aerial conidia in oil using ULV techniques (8.9 days) or submerged conidia in modified (water plus adjuvants) ULV (MULV) (nine days) or in water-based (VLV) applications (9-3 days). Both aerial and submerged conidia persisted long enough in the environment to effect significant mortality via secondary pick-up of spray residue from vegetation. Persistence was greatest in the ULV and MULV treatments, where the oil component of the formulations provided greater protection of the conidia from environmental stresses. The consequences of secondary pick-up of conidia from the different treatments on total mortality from a single application were examined using a simple host-pathogen model. This predicted that the ULV treatment would be much more effective than the other treatments under conditions where direct contact with the spray was limited. The results of these investigations are discussed in the context of development of optimum spray strategies for control of locusts and grasshoppers, and other pests, under different environmental conditions.

AB - A study was carried out to investigate the relative infectivity of aerial and submerged conidia of Metarhizium flavoviride to Schistocerca gregaria and Zonocenis variegatus. The effect of formulation and application method on initial infectivity and field persistence of these conidia was investigated. Strain IMI 330189 was highly virulent to S. gregaria but showed relatively low virulence to Z. variegatus. Direct contact with conidia from the initial spray application resulted in 100% mortality of S. gregaria for all formulation and application combinations. The mean survival time of infected locusts was significantly shorter for treatments using a knapsack sprayer containing submerged conidia in water plus 10 ml litre-1 'Codacide'® (seven days), than treatments with aerial conidia in oil using ULV techniques (8.9 days) or submerged conidia in modified (water plus adjuvants) ULV (MULV) (nine days) or in water-based (VLV) applications (9-3 days). Both aerial and submerged conidia persisted long enough in the environment to effect significant mortality via secondary pick-up of spray residue from vegetation. Persistence was greatest in the ULV and MULV treatments, where the oil component of the formulations provided greater protection of the conidia from environmental stresses. The consequences of secondary pick-up of conidia from the different treatments on total mortality from a single application were examined using a simple host-pathogen model. This predicted that the ULV treatment would be much more effective than the other treatments under conditions where direct contact with the spray was limited. The results of these investigations are discussed in the context of development of optimum spray strategies for control of locusts and grasshoppers, and other pests, under different environmental conditions.

UR - http://www.scopus.com/inward/record.url?scp=0029661228&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0029661228&partnerID=8YFLogxK

U2 - 10.1002/(SICI)1096-9063(199604)46:4<299::AID-PS362>3.0.CO;2-L

DO - 10.1002/(SICI)1096-9063(199604)46:4<299::AID-PS362>3.0.CO;2-L

M3 - Article

VL - 46

SP - 299

EP - 306

JO - Pest Management Science

JF - Pest Management Science

SN - 1526-498X

IS - 4

ER -