Development and incidence of Neozygites fresenii (Nowakowski) Remaudiere & Keller (Zygomycetes:Entomophthorales) in aphis craccivora Koch and its pathogenicity to three other aphididae (Hemiptera)

Issue Date

4-2000

Abstract

Laboratory and field experiments were conducted to examine the development, pathogenicity and incidence of Neozygites fresenii (Nowakowski) Remaudiere & Keller in Aphis craccivora Koch infesting some legumes in the Visayas State College of Agriculture, Baybay, Leyte. Based on squashed mounts of N. fresenii-inoculated aphids, it took only 54 h post-inoculation for the aphids to succumb to mycosis. Developmental stages according to initial occurence were protoplasts, hyphal bodies, conidiophores, primary conidia and capilliconidia. Three other aphid species were inoculated with capilliconidia of N. fresenii from A. craccivora. The most susceptible was Aphis citricola van der Goot followed by Brevicoryne brassicae (L.) with an average mortality of 53% and 41%, respectively, after five days incubation. Only 28% of Rhopalosiphum maidis (Fitch) were killed by mycosis after the same period. Results from the weekly monitoring of A. craccivora on bush bean, string beans and mungbean, indicated that less than 30% of the aphid samples were infected at the beginning of the first cropping season, but this gradually increased with time on all vegetable legumes. In the second trial, there was over 60% infected aphids recorded at the start of the season. On the other hand, the biweekly incidence of N. fresenii in aphids on Gliticida sepium (Jacq.) Steud. was consistently high, ranging from 53-100% throughout the observation period, except after several days of intermittent rains.

Source or Periodical Title

Philippine Entomologist

ISSN

0048-3753

Volume

14

Issue

1

Page

37-48

Document Type

Article

Frequency

semi-annually

Physical Description

illustrations, graphs, tables

Language

English

En – AGROVOC descriptors

APHIS CRACCIVORA; HEMIPTERA; NEOZYGITES; APHIDOIDEA; ENTOMOGENOUS FUNGI; BIOLOGICAL CONTROL

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