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Improved physical control of insects by combining air blowing and suction drag forces
Year:
2012
Authors :
Afgin, Yiftah
;
.
Ben-Yakir, David
;
.
Gan-Mor, Samuel
;
.
Regev, Rafi
;
.
Weissblum, Aharon
;
.
Volume :
Co-Authors:
Facilitators :
From page:
1
To page:
4
(
Total pages:
4
)
Abstract:

Development of physical means to reduce insect pests of agricultural crops is needed to meet the growing restrictions on the use of chemical pesticides. Insect suction by itself provided poor reduction of insect pest populations because of sharp decrease in the air velocity. Consequently, low drag forces were evident even at short distances from the blower inlet. Adult insects have large wing spans that impose large drag forces during suction from a plant canopy. Thus, suction alone can give an effective reduction of adults. However, the immature stages such as larva and pupa have small drag forces and thus higher air velocities are required to remove them. Suction and blowing air velocities at distances typical for insect removal from canopies and the predicted drag forces created by various insect shapes are investigated in the present study. Machines were designed to include suction only and suction with blowing systems, were constructed and tested. Drag forces analysis for a typical insect such as a larva of the onion thrips (Thrips tabaci) showed that 2.5 m/s air velocity is required to cause it to hover. A system utilizing combined blowing and suction provided good reduction of onion thrips on chives (Allium schoenopransum). Daily treatment in chives greenhouse resulted in a 2.8 times reduction in thrips numbers compare to no treatment, and an average reduction of 1.7 times in thrips feeding damage to the leaves.

Note:
Related Files :
Blowing
Insect control
insects
pest control
Physical control
plant protection
suction
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Related Content
More details
DOI :
Article number:
0
Affiliations:
Database:
Google Scholar
Publication Type:
Conference paper
;
.
article
;
.
Language:
English
Editors' remarks:
ID:
41399
Last updated date:
02/03/2022 17:27
Creation date:
17/06/2019 15:27
Scientific Publication
Improved physical control of insects by combining air blowing and suction drag forces

Development of physical means to reduce insect pests of agricultural crops is needed to meet the growing restrictions on the use of chemical pesticides. Insect suction by itself provided poor reduction of insect pest populations because of sharp decrease in the air velocity. Consequently, low drag forces were evident even at short distances from the blower inlet. Adult insects have large wing spans that impose large drag forces during suction from a plant canopy. Thus, suction alone can give an effective reduction of adults. However, the immature stages such as larva and pupa have small drag forces and thus higher air velocities are required to remove them. Suction and blowing air velocities at distances typical for insect removal from canopies and the predicted drag forces created by various insect shapes are investigated in the present study. Machines were designed to include suction only and suction with blowing systems, were constructed and tested. Drag forces analysis for a typical insect such as a larva of the onion thrips (Thrips tabaci) showed that 2.5 m/s air velocity is required to cause it to hover. A system utilizing combined blowing and suction provided good reduction of onion thrips on chives (Allium schoenopransum). Daily treatment in chives greenhouse resulted in a 2.8 times reduction in thrips numbers compare to no treatment, and an average reduction of 1.7 times in thrips feeding damage to the leaves.

Scientific Publication
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