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399729

EFFECT OF BACILLUS THURINGIENSIS BERLINER, A CHEMICAL INSECTICDE AND ITS MIXTURES AGAINST THE UNPARASITIZED AND PARASITIZED SPODOPTERA LITTORALIS (BOISD.) LARVAE

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Last updated: 30 Dec 2024

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Abstract

The second instar larvae of the cotton leafworm spodoptera lit­toralis (4 days old) were fed after four days of being parasitized individ­ually by Microplitis rufiventris Kok. (=8 days old) on castor bean leaves dipped in different concentrations of Bacillus thuringiensis (delfin), the pyrethroid (baythroid) and their combinations. Data indicate that the parasitized larvae showed lower mortality rates that those of unparasi­tized ones. Consequently, the LC50 values were larger in case of parasi­tized larvae than those required for unparasitized ones at the same age. The combination of delfin and LC1 0 level of baythroid showed mortality ranged between their individual values. Data also show latent or delayed toxicity of the tested insecti­cides on the parasitoid progeny. Bioinsecticide latent effect is very low as regards cocoon formation and even adult emergence. The immature larvae of the parasitoid complete their development in B. thuringiensis infected host, if the host does not die before the maturity of the larval parasitoid inside it completed. While the latent toxicity of chemical in­secticide is more than that of the bioinsecticide, but the combination of the two insecticides ranges in between.

DOI

10.21608/ejar.2000.399729

Authors

First Name

ALY A.

Last Name

EL-MOURSY

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Affiliation

Department of Entomology, Faculty of Science, Cairo University, Giza, Egypt

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First Name

ESMAT A.

Last Name

KARES

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Affiliation

Plant Protection Research Institute, Agricultural Research Centre, Dokki, Giza, Egypt

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First Name

NAWAL

Last Name

ZOHDY

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Affiliation

Department of Entomology, Faculty of Science, Cairo University, Giza, Egypt

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First Name

AMINA M.

Last Name

ABDEL-RAHMAN

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Affiliation

Department of Entomology, Faculty of Science, Cairo University, Giza, Egypt

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First Name

MONA B. R.

Last Name

EL-MANDARAWY

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Affiliation

Plant Protection Research Institute, Agricultural Research Centre, Dokki, Giza, Egypt

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Volume

78

Article Issue

4

Related Issue

52210

Issue Date

2000-12-01

Receive Date

1999-07-07

Publish Date

2000-12-01

Page Start

1,587

Page End

1,601

Print ISSN

1110-6336

Online ISSN

2812-4936

Link

https://ejar.journals.ekb.eg/article_399729.html

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https://ejar.journals.ekb.eg/service?article_code=399729

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12

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Original Article

Type Code

1,041

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Journal

Publication Title

Egyptian Journal of Agricultural Research

Publication Link

https://ejar.journals.ekb.eg/

MainTitle

EFFECT OF BACILLUS THURINGIENSIS BERLINER, A CHEMICAL INSECTICDE AND ITS MIXTURES AGAINST THE UNPARASITIZED AND PARASITIZED SPODOPTERA LITTORALIS (BOISD.) LARVAE

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Article

Created At

30 Dec 2024