Dimethoate for Control of Western Cherry Fruit Fly on Sweet Cherry in Oregon12

Developing Drosophila suzukii management programs for sweet cherry in the western United States

“…The infestation did not exceed one larva per 100 fruit in the 9 and 15 June samples, with no significant differences among treatments. These low levels occurred about the same time as harvest (7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20)(21)(22). Infestation rose markedly in the 23 June sample, with significantly higher levels of infestation (4.7-7.7 larvae) in the one-application regime and untreated check (F 4,8 = 5.06, P = 0.020).…”

“…5,8,9 Spinosad bait had largely displaced the use of broadspectrum organophosphates in the immediate preharvest period, primarily malathion applied by air. 10 The use of post-harvest sprays for sanitation 11 was commonly used, but neonicotinoids had displaced dimethoate because of phytotoxicity concerns with the latter. 4 The invasion of this new pest species disrupted existing pest management programs, and was extremely problematic for the cherry-growing industries of all regions affected.…”

Residues of dimethoate and dimethoxon on sweet cherries following air carrier application

“…Dimethoate [ , -dimethyl S-(iV-methylcarbamoylmethyl) phosphorodithoate] is registered on pome fruits for the control of a variety of insect pests in the United States and Canada. Following investigations of Banham (1974) in Canada, we evaluated efficacy of dimethoate for western cherry fruit fly (Rhagoletis indifferens Curran) control on sweet cherries in Oregon (Zwick et al, 1975) and found that one application of dimethoate provided excellent protection over an entire season. Presently, dimethoate is registered for control of cherry fruit fly in Canada but not in the United States.…”

“…We have been attempting to collect sufficient efficacy and residue data to support registration of this compound on cherries in the United States. Since previous residue studies of MacNeil et al (1975) and Zwick et al (1975) were based on hydraulic handgun applications which are not in general commerical use, we are presenting here the results of dimethoate residue analyses resulting from air carrier applications as would be applicable to commercial cherry orchards. In addition, residues resulting from the use of a wettable powder formulation are compared with those resulting from an emulsifiable concentrate application.…”

Status of <I>Rhagoletis</I> (Diptera: Tephritidae) Pests in the NAPPO Countries

“…How and whether the presence of spotted wing drosophila, Drosophila suzukii Matsumura (Drosophilidae) (Walsh et al 2010), in cherries will affect R. indifferens control is unclear, as spinosad bait does not appear effective against D. suzukii; however, producers may still be able to use spinosad bait early in the cherry season when few D. suzukii are present (Warner 2012). After preharvest insecticide sprays, a spray of the organophosphate dimethoate is used by some growers to kill any immature stages inside unpicked fruit (Zwick et al 1975). Methyl bromide is effective at killing larvae inside cherries (MofÞtt et al 1977) and is required by some export markets.…”