Name: Video: Collection, Maintenance, and Molecular Identification of Mustard Aphids
Uploaded: 2023-07-21T14:20:00
Description: 125 Views. Collection, Maintenance, and Molecular Identification of Mustard Aphids

collection, maintenance, and molecular identification of mustard aphids

Optimized Bioassay for Entomopathogenic Fungi Against Mustard Aphid

The mustard aphid (L. erysimi) is a notorious pest that infests a variety of cruciferous crops, causing significant economic losses1. While several systematic insecticides have been recommended to combat aphid infestations, the frequent use of these insecticides raises concerns about pesticide resistance2,3. Therefore, in terms of eco-friendly pest management, entomopathogenic fungi (EPF) could serve as a suitable alternative control strategy. EPF is an insect pathogen with the ability to infect hosts by penetrating their cuticles, making it a potent agent for controlling aphids and other plant-sucking insects4. Furthermore, EPF has proven to be a feasible and sustainable pest management technique, offering benefits such as plant pathogen antagonism and plant growth promotion5.
EPF can be obtained through insect-soil baiting or isolated from insect cadavers in the field6,7. However, before further use of fungal isolates, pathogenicity screening is necessary. Several studies have been conducted on the effectiveness of EPF against aphids, which are significant crop pests that can cause severe damage8,9. Mustard aphids, among various species of aphids, have been tested for susceptibility to several strains of Beauveria spp., Metarhizium spp., Lecanicillium spp., Paecilomyces spp., and even Alternaria, which is primarily known as a saprophytic and plant pathogenic fungus but has shown some lethal effects against mustard aphids10,11,12.
To evaluate the effectiveness of EPF against aphids under laboratory conditions, bioassays can be divided into two main parts: the inoculation chamber and fungal inoculation. The current protocol describes the construction of an inoculation chamber, where aphids can be maintained using various methods such as an excised leaf with a petiole wrapped in moist cotton, an excised leaf disc with a Petri dish lined with damped filter paper, direct maintenance on pot plants, or an excised leaf disc embedded in water agar within a Petri dish or container10,11,13. Common methods for fungal inoculation include conidia spraying, aphid immersion into a conidia suspension, leaf dipping into a conidia suspension, and plant endophyte inoculation11,14,15,16. While various inoculation methods exist, the bioassays should simulate field application conditions. For example, in the case of the leaf dipped method12,17, the efficiency of EPF can be evaluated, but since the aphids infest the fungus-loaded leaves, the dorsal side of the aphid, which is a preferential penetration site, does not usually get exposed to the fungus.
To evaluate the aphidicidal effect of EPF under laboratory conditions, this protocol suggests using the detached-leaf method described by Yokomi and Gottwald18 with some modifications, followed by conidia inoculation using a micro-sprayer. This method maintains approximately 100% humidity in the bioassay chamber for at least seven days without requiring additional replenishment of water18,19. Additionally, confining aphids to one surface ensures their exposure to conidia spraying and facilitates observations20. However, aphids may become stuck in the exposed agar surface while moving within the inoculation chamber. Furthermore, recording data in the Petri dish experiment with mustard aphids, which are parthenogenetic insects, can be challenging due to their rapid development and reproduction. It is difficult to distinguish between inoculated adults and their progeny without removal. The details of how to proceed with this step are seldom mentioned, and some inconsistent factors, such as leaf consumption area, need to be optimized.
This protocol demonstrates a stable system for screening the virulence of EPF isolates against mustard aphids, enabling the selection of potential isolates against various aphid species from an extensive EPF library. Field-collected aphids can be identified, and a sufficient laboratory population of mustard aphids can be established to evaluate the aphidicidal effect of various fungal isolates using an easy and feasible methodology with consistent outcomes. Aphids have developed multiple evolutionary mechanisms in response to intense and repeated anthropogenic pressures in agroecosystems, posing challenges to food security9. Therefore, this described method could be extended to evaluate potential EPF isolates against various aphid species.

Author Spotlight: Eco-Friendly Pest Management Using Entomopathogenic Fungi Against Mustard Aphids 

Assessment of Aphidicidal Effect of Entomopathogenic Fungi against Parthenogenetic Insect, Mustard Aphid, Lipaphis erysimi (Kalt.)

Watch this Scientific Journal Video about Collection, Maintenance, and Molecular Identification of Mustard Aphids at JoVE.com

Collection, Maintenance, and Molecular Identification of Mustard Aphids

collection-maintenance-and-molecular-identification-of-mustard-aphids

Research

JoVE Journal

Biology

125 Views. Collection, Maintenance, and Molecular Identification of Mustard Aphids

Video: Collection, Maintenance, and Molecular Identification of Mustard Aphids

The mustard aphid (L. erysimi) is a pest that infests various cruciferous crops and transmits plant viruses. To achieve eco-friendly pest management, entomopathogenic fungi (EPF) are potential microbial control agents for controlling this pest. Therefore, virulence screening of EPF isolates under Petri dish conditions is necessary before field application. However, the mustard aphid is a parthenogenetic insect, making it difficult to record data during Petri dish experiments. A modified system for detached-leaf bioassays was developed to address this issue, using a micro-sprayer to inoculate conidia onto aphids and prevent drowning by facilitating air-drying after spore suspension. The system maintained high relative humidity throughout the observation period, and the leaf disc remained fresh for over ten days, allowing parthenogenetic reproduction of the aphids. To prevent offspring buildup, a process of daily removal using a painting brush was implemented. This protocol demonstrates a stable system for evaluating the virulence of EPF isolates against mustard aphids or other aphids, enabling the selection of potential isolates for aphid control.

This protocol presents an optimized detached-leaf bioassay system for evaluating the effectiveness of entomopathogenic fungi (EPF) against the mustard aphid (Lipaphis erysimi (Kalt.)), a parthenogenetic insect. The method outlines the data collection process during Petri dish experiments, enabling researchers to consistently measure the virulence of EPF against mustard aphids and other parthenogenetic insects.

The mustard aphid (L. erysimi) is a pest that infests various cruciferous crops and transmits plant viruses. To achieve eco-friendly pest management, ...