An oppositely charged insect exclusion screen with gap-free multiple electric fields

Matsuda, Yoshinori; Kakutani, Koji; Nonomura, Teruo; Kimbara, Junji; Kusakari, Shin-ichi; Osamura, Kazumi; Toyoda, Hideyoshi

doi:10.1063/1.4767635

Cited by 25 publications

(45 citation statements)

References 7 publications

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“…From these results, it appeared that the best way to prevent whiteflies from entering through the entrance door was to develop an electrostatic guarding method for the entrance area. A doubly charged dipolar electric field screen (DD-screen; Matsuda et al, 2012) was used for this purpose. In the current study, a small pre-entrance room is constructed at the entrance area, and three DD-screens (with yellow and gray board or gray net) are installed in three parts of the pre-entrance room taking into consideration the wind flow inside the room, as most whiteflies are brought in by the air when the door is opened.…”

Section: Introductionmentioning

confidence: 99%

Prevention of Whitefly Entry from a Greenhouse Entrance by Furnishing an Airflow-Oriented Pre-Entrance Room Guarded with Electric Field Screens

Nonomura¹,

Matsuda²,

Kakutani³

et al. 2014

JAS

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Two types of an electric field screen were used to exclude whiteflies from a greenhouse. Singly charged dipolar electric field screen had insulated conductor iron wires arrayed in parallel (ICW-layer), two earthed metal nets on both sides of the ICW-layer, and a direct current voltage generator. Screens were attached to the lateral windows of the greenhouse to repel whiteflies that approached the nets. To electrostatically guard the greenhouse entrance, doubly charged dipolar electric field screens (DD-screens) were used to capture whiteflies entering through the door. The ICWs, oppositely charged with equal voltages, were arrayed one after the other, and an insulator board or net was placed on one side of the ICW-layer. ICWs captured whiteflies entering an electric field of DD-screens. A small pre-entrance room was constructed at the entrance area, and three DD-screens (with yellow and gray board or gray net) were installed in the pre-entrance room taking into consideration the airflow inside the room, as most whiteflies were brought in by the air when the door was opened. Two DD-screens with the board were useful for directing the wind toward the wall into which the netted DD-screen was integrated. Insects were eliminated by this screen, and the pest-free air was circulated inside the greenhouse. The yellow-boarded DD-screen was highly attractive because of the photo-selective movement of the whiteflies and was effective for trapping the whiteflies when there was no wind. Our electrostatic method is effective at keeping the greenhouse pest-free throughout the entire period of tomato cultivation.

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Section: Introductionmentioning

confidence: 99%

Prevention of Whitefly Entry from a Greenhouse Entrance by Furnishing an Airflow-Oriented Pre-Entrance Room Guarded with Electric Field Screens

Nonomura¹,

Matsuda²,

Kakutani³

et al. 2014

JAS

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“…A double-charged dipolar-type screen is easily constructed by linking the ICWs alternately to negative and positive voltage generators (Nonomura et al, 2014a;Matsuda et al, 2012), forming an electric field between the oppositely charged conductor wires. We know that some electrons are present in air.…”

Section: Insect-capturing Function Of a Double-charged Dipolar Electrmentioning

confidence: 99%

A Promising Physical Pest-Control System Demonstrated in a Greenhouse Equipped With Simple Electrostatic Devices That Excluded All Insect Pests: A Review

Takikawa¹,

Kakutani²,

Matsuda³

et al. 2019

JAS

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Applied electrostatic engineering can be used to construct greenhouses that prevent entry of insect pests. Two types of electric field screen were used to exclude pests from the greenhouse: single- and double-charged dipolar electric field screens (S- and D-screen, respectively). The S-screen consisted of iron insulated conductor wires (ICWs) arrayed in parallel (ICW-layer), a grounded metal net on either side of the ICW-layer, and a direct current voltage generator. S-screens were attached to the side windows of the greenhouse to repel whiteflies (Bemisia tabaci) that approached the nets. The D-screen was installed in a small anteroom at the greenhouse entrance to capture whiteflies entering through it. The ICW-layers of the D-screen were oppositely charged with equal voltages and arrayed alternately, and an insulator board or grounded metal net was placed on one side of the ICW-layer. The ICW-layers captured whiteflies entering the electric field of the double-charged dipolar electric field. Three screens equipped with yellow or gray boards or a grounded metal net were installed in the anteroom based on the airflow inside the room, as most whiteflies were brought in by air when the door was opened. Two D-screens with boards were useful for directing the airflow toward the wall with the netted D-screen. This screen eliminated the insects and the pest-free air was circulated inside the greenhouse. The D-screen with the yellow board attracted the whiteflies and was effective for trapping them when there was no wind. Our method kept the greenhouse pest-free throughout the entire period of tomato (Solanum lycopersicum) cultivation.

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“…The third electric field screen (DD-screen) forms gap-free electric fields with no spaces for insect escape. 57 In this configuration, a static electric field is generated between the charged insulated conductor wire and the earthed net and between the oppositely charged conductor wires. A unique feature of this type of electric field screen is the locally different polarization of the uninterrupted earthed net; a net part facing an electric filed produced by the negatively charged conductor wire polarizes positively, and another net part facing an electric field by the positively charged conductor wire polarizes negatively.…”

Section: Dd-screenmentioning

confidence: 99%

“…Cover sleeves are dielectrically polarized, positively on the surface of the iron wire side and negatively on the outer surface of the insulator sleeve in the ICW(-), and vice versa in the ICW(+). 57 The opposite surface charges on the ICWs act as dipoles that create an electric field between them. The ability of the Bb-EFS to trap greenhouse pests was effective enough to minimize their population in the greenhouse.…”

Section: Bamboo Blind-type Electric Field Screenmentioning

confidence: 99%

“…Cover sleeves are dielectrically polarized positively on the surface of the iron wire side and negatively on the outer surface of the insulator sleeve in ICW(-) and vice versa in ICW(+). 57 The opposing surface charges on the ICWs act as dipoles that form an electric field in-between. The two layers of ICWs are integrated in the frame of the racket surface (table tennis racket size) and two voltage generators together with a storage battery are put inside the hand grip.…”

Section: Electrostatic Flying Insect Catchermentioning

confidence: 99%

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Novel electrostatic devices for managing biotic and abiotic nuisances in environments

Matsuda¹,

Toyoda²

2018

OAJS

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Environmentalnuisances controlled by the electrostatic approaches Fungal sporesThe first environmental nuisance is airborne conidia (asexual spores) of plat pathogenic fungi, especially the prolific fungal pathogens causing diseases in pre-and post-harvest agricultural crops. AbstractBackground: Principles of basic electrostatics have been used to develop new novel apparatuses for managing biotic and abiotic invasive nuisances in different environments. Biotic targets were air-borne spores of plant pathogenic fungi and pollen grains causing pollinosis and insect pests transmitting pathogens of crop plants, livestock and humans, and as an abiotic target smoke fine particle causing various human diseases. To control these environmental nuisances, unique phenomena generated in the electric field were applied to the apparatuses to capture or repel the targets. The discharge-free electric field, which was generated between the opposite charges of the earthed non-insulated conductor and the insulated conductor charged, was highly effective to create an electrostatic attractive force to trap biotic targets. The discharge-generating electric field was an alternative method to create the attractive force by negatively ionizing smoke fine particles in the electric field, to kill pathogenic microbials by exposing streamer discharge-based ozone or corona discharge-based plasma stream to them, and to electrocute insect pests by shooting high-energy free electrons to them. These theoretical and technical progresses enable not only to create spore-free and pest-free space in agricultural and horticultural environments for crop production and preservation, but to purify indoor air in human domestic environments.

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An oppositely charged insect exclusion screen with gap-free multiple electric fields

Cited by 25 publications

References 7 publications

Prevention of Whitefly Entry from a Greenhouse Entrance by Furnishing an Airflow-Oriented Pre-Entrance Room Guarded with Electric Field Screens

Prevention of Whitefly Entry from a Greenhouse Entrance by Furnishing an Airflow-Oriented Pre-Entrance Room Guarded with Electric Field Screens

A Promising Physical Pest-Control System Demonstrated in a Greenhouse Equipped With Simple Electrostatic Devices That Excluded All Insect Pests: A Review

Novel electrostatic devices for managing biotic and abiotic nuisances in environments

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