The Effectiveness of Various Pesticides against Resistant Two-Spotted Spider Mites on Greenhouse Roses

Allen, William W.; Ota, Asher K.; Gehring, R. D.

doi:10.1093/jee/57.2.187

Cited by 8 publications

(3 citation statements)

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“…"Torak" was the only chemical which caused phytotoxicity in these experiments. Phytotoxicity with other chemicals has, however, been reported by Allen et al (1964), Emery et al (1965) and Binns (1969). Grower experience shows that phytotoxicity can vary between nurseries and between cultivars and demonstrates that more information is required before efficient acaricides can be more widely used on susceptible cultivars.…”

Section: Winter Treatmentsmentioning

confidence: 99%

Chemical Control of Red Spider Mite on Glasshouse Roses

French

Ludlam

1972

Plant Pathology

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SUMMARY On a commercial nursery in east Kent where red spider mite (Tetrany‐ chus urticae(Koch)) showed resistance to demeton‐S‐methyl, dicofol and quinomethionate, alternative control chemicals were investigated during 1968 and 1969. Chlorphenamidine, dinobuton, formetanate, methomyl, “Pentac” and chlorphenamidine plus formetanate all gave good control of the mite. Tetradifon gave good control in 1968 but not in 1969. Aldicarb proved ineffective in the one experiment in 1968, but good and persistent control was obtained in two of the three experiments in 1969. Binapacryl, fenazaflor, GS19851 and “Torak” did not significantly decrease mite numbers. On a nursery in west Sussex, dinobuton, endosulfan, formetanate and quinomethionate applied in February 1971 to unpruned rose bushes, heavily infested with red spider mite, all gave good control of mites and eggs.

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Section: Winter Treatmentsmentioning

confidence: 99%

Chemical Control of Red Spider Mite on Glasshouse Roses

French

Ludlam

1972

Plant Pathology

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“…Dienochlor (Pentac; Ll'^^S.S'^'.S^'-decachlorobi-2,4-cyclopentadien-l-yl) is a miticide prepared by catalytic reduction of hexachlorocyclopentadiene (Figure 1) (1,2). It has been used for 30 years (3) with registrations restricted to ornamental plants. Dienochlor is stable to acids and bases but is converted to octachlorofulvalene by chemical reducing agents (Figure 1) (4,5).…”

Section: Introductionmentioning

confidence: 99%

Adducts of Dienochlor Miticide with Glutathione, Glutathione S-Transferases, and Hemoglobins

Fruetel¹,

Sparks²,

Quistad³

et al. 1994

Chem. Res. Toxicol.

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Dienochlor (Pentac) (C10Cl10) has been used for 30 years as a miticide with little knowledge of its mode of action or metabolic fate except that it is quickly degraded by rats. This study examines the reactions of dienochlor with GSH and proteins as models for its metabolism and interactions with tissues. Dienochlor reacts rapidly with 1.0 mM GSH in phosphate buffer (pH 7.4) at 37 degrees C (t1/2 approximately 11 min) as analyzed by UV/visible spectroscopy and HPLC, yielding a series of more than a dozen adducts. Octachlorofulvalene (C10Cl8), a candidate intermediate, also reacts to give the same apparent products (t1/2 < 0.2 min as above); however, its intermediacy in the dienochlor reaction was not established. Isolation and MS analyses characterized two isomeric C10H2Cl(SG)5 adducts and a C10H2(SG)6 derivative; these products react further in the presence of GSH to yield two even more polar adducts. Cysteine and N-acetylcysteine also react rapidly with dienochlor whereas GSSG and several non-thiol amino acids are much less reactive. Purified GSH S-transferases (GSTs) and hemoglobins, each from six species of mammals including humans, are extensively labeled in vitro by [14C]dienochlor to form adducts separable by gel electrophoresis and HPLC. [14C]Dienochlor readily derivatizes rat liver GSTs even in cytosol and in the presence of high GSH levels. The potency of dienochlor for inhibition of GST activity is maintained or enhanced upon conversion to GSH adducts.(ABSTRACT TRUNCATED AT 250 WORDS)

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“…Dienochlor [1, Pentac miticide, bis(pentachloro-2,4cyclopentadien-l-yl)] has been used on ornamental plants for control of phytophagous mites since 1964 (Allen et al, 1964). Although 1 is known to be photolabile in sunlight, its photodegradation products are heretofore unreported.…”

mentioning

confidence: 99%