Management of balsam twig aphids in Christmas trees

Cowles, Richard S.

doi:10.5962/bhl.title.51317

Inspection of Feed Products and Pet Foods

2003

DOI: 10.5962/bhl.title.51317

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Management of balsam twig aphids in Christmas trees

Richard S. Cowles¹

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2010

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“…For example, imidacloprid can selectively control balsam twig aphids and various adelgids as a low-dosage foliar spray (Cowles 2003), whereas bifenthrin is applied as a spot treatment to the leader of the tree or to freshly cut stumps to manage white pine weevil, Pissodes strobi (Peck), and Hylobius pales (Herbst), respectively (Cowles 2005). Conditions are favorable for conserving natural enemies within Christmas tree plantations for IPM practice, with the exception of current practices for managing armored scales.…”

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Optimizing a Basal Bark Spray of Dinotefuran to Manage Armored Scales (Hemiptera: Diaspididae) in Christmas Tree Plantations

Cowles¹

2010

jnl. econ. entom.

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The armored scales Fiorinia externa Ferris and Aspidiotus cryptomeriae Kuwana (Hemiptera: Diaspididae) are increasingly damaging to Christmas tree plantings in southern New England. The systemic insecticide dinotefuran was investigated for selectively suppressing armored scale populations relative to their natural enemies in cooperating growers' fields in 2008 and 2009. Banded soil application of dinotefuran resulted in poor control. However, a dinotefuran spray applied to the basal 25 cm of trunk resulted in its absorption through the bark, translocation to the foliage, and good efficacy. The basal bark spray did not significantly impact the activity of predators Chilocorus stigma (Say) or Cybocephalus nipponicus Enrody-Younga and in 2009 showed a dosage-dependent improvement in the percentage of scales parasitized by Encarsia citrina Craw. A field dosage-response factorial experiment revealed that a 0.25% (vol:vol) addition of a surfactant with dinotefuran did not enhance insecticidal effect. Probit-transformed scale population reduction relative to the untreated check was subjected to linear regression analysis; reduction of scale populations was proportional to the log of insecticide dosage, whereas basal bark spray efficacy declined in proportion to the cube of tree height. The regression equation can be used to optimize dosage relative to tree height. Excellent efficacy resulted from basal bark spray application dates of 28 April (prebud break) to mid-June, but earlier spray timing within that treatment window had fewer crawlers discoloring new growth with their short-lived feeding. A basal bark spray of dinotefuran is well suited for integration with natural enemies to manage armored scales in Christmas tree plantations.

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confidence: 99%

Optimizing a Basal Bark Spray of Dinotefuran to Manage Armored Scales (Hemiptera: Diaspididae) in Christmas Tree Plantations

Cowles¹

2010

jnl. econ. entom.

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Management of balsam twig aphids in Christmas trees

Cited by 1 publication

References 3 publications

Optimizing a Basal Bark Spray of Dinotefuran to Manage Armored Scales (Hemiptera: Diaspididae) in Christmas Tree Plantations

Optimizing a Basal Bark Spray of Dinotefuran to Manage Armored Scales (Hemiptera: Diaspididae) in Christmas Tree Plantations

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