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LABORATORY STUDIES OF SPRAY DEPOSITS ON THE MIGRATORY GRASSHOPPER (MELANOPLUS SANGUINIPES) (ORTHOPTERA: ACRIDIDAE)1

Published online by Cambridge University Press:  31 May 2012

K. S. McKinlay
K. S. McKinlay
Affiliation:
Research Station, Canada Department of Agriculture, Saskatoon, Saskatchewan
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Abstract

Hydraulic, fan-spray nozzles (Teejet 650067) at 50.8 cm (20 in.) spacing, 55.9 cm (22 in.) above the target surface, and operating at 2.8 kg/cm2 (40 p.s.i.) produced very uneven coverage when applying aqueous sprays containing uranine. Deposits immediately below the nozzles were 2 to 3 times more than those between nozzles.

Deposits on grasshoppers (Melanoplus sanguinipes F.) were directly proportional to their plan area. Since this area increases as the square of the linear dimensions and weight increases as the cube, second instar grasshoppers collected twice as much spray/unit weight as fourth instar nymphs and 3 times as much as adult females. These differences were reflected in the mortality caused by insecticide sprays. A spray applying dimethoate at 140 g/ha (2 oz/ac) in 39.3 l./ha (3.5 Imp. g.p.a.) killed 90% of second instar nymphs but only 14% of adult males.

Type
Articles
Information
The Canadian Entomologist , Volume 106 , Issue 10 , October 1974 , pp. 1103 - 1108
Copyright
Copyright © Entomological Society of Canada 1974

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References

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