Impaction of Insecticide Particles on Western Spruce Budworm Larvae and Douglas-fir Needles12

Barry, John W.; Ciesla, William M.; Tysowsky, Michael; Ekblad, Robert B.

doi:10.1093/jee/70.3.387

Cited by 16 publications

(7 citation statements)

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“…small droplets(<50 p,m) are reported to be most effective in controlling some insect species (Himel and Moore 1967;Spillman 1976;Barry et al 1977). However, data from the current study indicate that Sumithion F20 with a coarse spray deposit was more effective in reducing budworm populations than Sumithion tech, which deposited predominantly as <50-p,m droplets.…”

Section: Resultscontrasting

confidence: 62%

DEUX NOUVELLES FOURMIS NÉARCTIQUES: LEPTOTHORAX RETRACTUS ET L. SPHAGNICOLUS (FORMICIDAE, HYMENOPTERA)

Francoeur

1986

Can Entomol

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Can. Ent. 118: 1143-1 149 (1986) Two Sumithion@ formulations were sprayed aerially to compare their effectiveness in controlling spruce budworm, Choristoneura fumiferana (Clemens), in balsam fir, Abies balsamea (L.) Mill. Sumithion 20% flowable, a new formulation, and Sumithion technical were applied twice at 210 g A1 (in 1.5 L of spray mix)!ha using a Cessna 188 Agtruck equipped with four Micronair atomizers. More than 95% of the technical and <45% of the Sumithion flowable spray droplets were <50 pm in diameter. Larval reduction ranged from 67 to 84% in the Sumithion flowable plots, from 52 to 55% in the Sumithion technical plots, and from 28 to 38% in the untreated plots. Postspray residual populations averaged 4.1, 6.2, and 10.3 larvae per 46-cm branch in the flowable, technical, and untreated blocks, respectively. Defoliation in the Sumithion flowable block averaged 18.5% and was not significantly different from the technical block but both were significantly less ( a = 0.05) than that in the untreated block, which averaged 46.2%. The results suggest that Sumithion 20% flowable was more efficacious in controlling spruce budworm than Sumithion technical insecticide. ResumeDeux prkparations de Sumithion@ ont kt6 pulvkrisees par air afin de comparer leur efficacitk de rkpression de la tordeuse des bourgeons de llCpinette, Choristoneura fumiferana (Clemens) sur la sapin baumier, Abies balsamea (L.) Mill. Le "Sumithion 20% flowable", une nouvelle prkparation, et le "Sumithion technical" ont kt6 appliquks deux fois a raison de 210 g IA (dans 1.5 L de mklange)/ha avec un Cessna 188 Agtruck kquipk de quatre buses Micronair. Plus de 95% des gouttelettes du "Sumithion technical" et <45% de celles du "Sumithion 20% flowable" avaient un diam2tre <50 pm. Le rkduction des larves a varik de 67 a 84% dans les parcelles traitkes au "Surnithion 20% flowable", de 52 ? I 55% dans celles traitkes au "Surnithion technical", et de 28 1 38% dans les parcelles tkmoins. Les populations larvaires post-traitement dans les mCmes parcelles Ctaient de 4,1, 6,2 et 10,3 larveslbranche de 46 cm, respectivement. La dkfoliaison moyenne dans le bloc "Surnithion 20% flowable" atteignait 18,5%, ne diffkrant pas significativement ( a =0,05) de celle du bloc tCmoin qui Ctait de 46,2%. Ces rksultats indiquent que le "Sumithion 20% flowable" est plus efficace pour la rkpression de la tordeuse que la prkparation "Sumithion technical".

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Section: Resultscontrasting

confidence: 62%

DEUX NOUVELLES FOURMIS NÉARCTIQUES: LEPTOTHORAX RETRACTUS ET L. SPHAGNICOLUS (FORMICIDAE, HYMENOPTERA)

Francoeur

1986

Can Entomol

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“…Sufficient empirical data are available today to justify spraying of small drops for forest insect control Moore, 1967, 1969; Barry et al, 1977;Barry and Ekblad, 1978;Joyce and Beaumont, 1978). In all cases, the biologically important drops were small.…”

Section: Introductionmentioning

confidence: 99%

“…observed a mean of 77 fluorescent particles (101,495/1,324) on a spruce budworm Barry et al (1977). obtained a value of 1.4 drops (150/108) per spruce budworm larva Barry and Ekblad (1978).…”

mentioning

confidence: 95%

Assessment of aerial spray deposits in a spruce forest using in-flight microencapsulation technique

Himel

Sundaram²,

Sundaram³

et al. 1987

J. of Env. Sc. & Hlth., Part B

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Spray drops were counted and sized on Kromekote ® cards at ground level, and on spruce foliage at canopy level, after aerial application of a formulation containing a microencapsulation medium, over a spruce forest in Ontario. The majority of drops (70%) on foliage was 20 -75 μm range. A coarse drop size spectrum was observed on cards with a maximum diameter (D max ) of 380 μm, and with 85% of the drops < 130 μm in diameter. Foliar drop analysis, on the other hand, indicated a finer spectrum with a D max of 150 μm, and with 85% of 195 196 HIMEL ET AL. the drops < 75 urn. These results were explained on the basis of formulation ingredients, atomizer setting, weather factors, and drop retention on target surfaces. The assessment of spray deposits on glass plates at ground level indicated that about 16% of the applied spray volume reached the forest floor, a value which is comparable to those obtained in previous forestry applications using the ultra-low-volume (ULV) technique.

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“…Consistent with the concern for accountancy and improving the efficiency of aerial application, researchers (JOYCE et al 1978;UK 1977;BARRY and EKBLAD 1977;THOMPSON et al 1977;ARMSTRONG and YULE 1978;SNOWDEN et al 1977;and HURTIG et al 1953) have given attention to drop deposition on the biological target. For coniferous trees, studies have examined larvae, foliage, and the tree itself as a collector.The rationale for this approach suggests that once we have determined what is being deposited on the target, in terms of number and size of spray drops, and can correlate this with target response, then steps can be taken to generate the proper number and size of drops to achieve the desired results.…”

Section: Generalmentioning

confidence: 99%

Deposition of pesticide drops on pine foliage from aerial application

Barry¹,

Wong²,

Kenney³

et al. 1981

Zeitschrift für Angewandte Entomologie

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The biological target is becoming increasingly more important in pesticide spray evaluation and to research directed toward improving the safety and effectiveness of pesticides. Various techniques have been used to study the nature of drops which impact and deposit on tree foliage. A few basic techniques are summarized in this paper. Additionally, results are presented on the assessment of drops directly on foliage of slash pine (Pinus elliottii Engelm.) and Ocala sand pine (Pinus clausa [Chapm. ex Engelm.] Vasey ex Sarg. var. clausa). This was one of several techniques used to assess spray coverage from an aerial spray on a project conducted by the United States Department of Agriculture, Forest Service, in cooperation with the Florida Forest Service. Testing was conducted at the Withlacoochee State Seed Orchard, Florida, during February 1980. Results show a greater deposit of spray drops in the upper tree crown than in the lower crown. This was true for both pine species; however, fewer drops per linear length of needle were found on the Ocala sand pine when compared to the slash pine. Zusammenfassung Zur Tröpfchenverteilung auf Kiefernnadeln bei aviochemischen Bekämpfungsmaßnahmen Im Hinblick auf die immer wichtiger werdenden biologischen Aspekte sowie die Erzielung noch gröerer Sicherheit und Wirksamkeit bei der Ausbringung pestizider Sprühmittel wird ein Literaturüberblick über verschiedene Sprühtechniken und ihre Ergebnisse gegeben. Zusätzlich werden die Erfahrungen aus eigenen Versuchen, die in den USA an Pinus elliottii und P. clausa im Februar 1960 durchgeführt wurden, mitgeteilt. Es ergab sich bei beiden Kiefernarten eine größere Ablagemenge an Tröpfchen in der oberen Kronenregion, jedoch waren die Nadeln von Pinus clausa pro Längeneinheit mit einer größeren Zahl Tröpfchen belegt als jene von P. elliottii.

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Impaction of Insecticide Particles on Western Spruce Budworm Larvae and Douglas-fir Needles12

Cited by 16 publications

References 0 publications

DEUX NOUVELLES FOURMIS NÉARCTIQUES: LEPTOTHORAX RETRACTUS ET L. SPHAGNICOLUS (FORMICIDAE, HYMENOPTERA)

DEUX NOUVELLES FOURMIS NÉARCTIQUES: LEPTOTHORAX RETRACTUS ET L. SPHAGNICOLUS (FORMICIDAE, HYMENOPTERA)

Assessment of aerial spray deposits in a spruce forest using in-flight microencapsulation technique

Deposition of pesticide drops on pine foliage from aerial application

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