Hi Waldo,
The tarnish plant bug (TPB) tend to move on and
off apple during the pre-bloom season. Since they
don't tend to 'linger' their exposure to
insecticides is limited. Admire (Imidacloprid),
provides low to moderate levels of toxicity in
the field due to this dynamic nature of the TPB.
In lab studies Calypso (thiacloprid) , Actara
(thiamethoxam), or Assail and (acetamiprid)
demonstrated relatively high levels of direct
toxicity to TPB but 'the residual toxicity of
these neonicotinoids to L lineolaris in orchards
was very short-lived' ('Pest Management Science'
reference below).
Imidacloprid has demonstrated relatively low
toxicity to the predatory mite T.pyri and A.
fallacious, but high direct toxicity to honey
bees ('Cornell Tree Fruit Guidelines' reference
below). The pyrethroid class has been the only
class effective against the TPB in the field. In
our studies in the mid-Hudson Valley of NY, a TC
and Pink application would be needed to get
control. Even at that we typically see 1% damage.
Yet if yearly damage reducing market quality is
below 3-4%, is it economically viable to make two
applications.
Peter
Pest Management Science
Volume 61, Issue 10 , Pages 991 - 996
The intrinsic toxicity of several neonicotinoids
to Lygus lineolaris and Hyaliodes vitripennis, a
phytophagous and a predacious mirid
Noubar J Bostanian 1 *, John M Hardman 2, Estelle Ventard 3, Gaétan Racette 1
1Horticultural Research and Development Centre,
Agriculture and Agri-Food Canada, 430 Gouin Blvd,
St Jean-sur-Richelieu, Qc, Canada, J3B 3E6
2Atlantic Food and Horticulture Research Centre,
Agriculture and Agri-Food Canada, 32 Main street,
Kentville, NS, Canada, B4N 1J5
3Établissement National d'Enseignement Supérieur
Agronomique de Dijon, 21 Bd Olivier de Serres,
218000 Quetigny, France
email: Noubar J Bostanian ([EMAIL PROTECTED])
*Correspondence to Noubar J Bostanian,
Horticultural Research and Development Centre,
Agriculture and Agri-Food Canada, 430 Gouin Blvd,
St Jean-sur-Richelieu, Quebec, Canada, J3B 3E6
Reference to trade names and proprietary products
does not imply that such names are unprotected.
No endorsement of names products or companies is
made or implied, nor is any criticism intended of
similar products or companies which are not
mentioned.
Keywords
toxicity * Hyaliodes vitripennis * Lygus
lineolaris * apple orchards * neonicotinoids
Abstract
The tarnished plant bug Lygus lineolaris (Palisot
de Beauvois) is a key pest of apples in eastern
Canada and, currently, chemical control is the
only way to manage this pest. Hyaliodes
vitripennis (Say) is a univoltine indigenous
predacious mirid and an integral part of
biological control programs for apples in certain
regions of Quebec. In worst-case laboratory
conditions, thiamethoxam, thiacloprid and
acetamiprid were exceptionally toxic to this
predacious mirid. The adults were more
susceptible than the nymphs. However, the
residual toxicity of these neonicotinoids to L
lineolaris in orchards was very short-lived.
Because of the short residual toxicity,
neonicotinoids should be applied when L
lineolaris is at maximum abundance and well
before eggs of H vitripennis hatch in late June.
Cornell Tree Fruit Guidelines,
Table 12. Activity Spectrum of pome fruit insecticides and acaricides
http://ipmguidelines.org/TreeFruits/content/CH07/default.asp#_Toc197765114
--
Peter J. Jentsch
Extension Associate
Department of Entomology
Cornell University's Hudson Valley Lab
3357 Rt. 9W; PO box 727
Highland, NY 12528
email: [EMAIL PROTECTED]
Phone 845-691-7151
Mobile: 845-417-7465
http://www.nysaes.cornell.edu/ent/faculty/jentsch/
