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I. The structure and stereochemistry of six gypsy moth antifeeding diterpenes, kalmitoxins I-VI, from Kalmia latifolia L. ; II. The isolation and characterization of a new iridoid glycoside, specioside from Catalpa speciosa Warder /El-Naggar, Sha'aban Fouad, January 1979 (has links)
No description available.
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Detection and characterization of resistance to pesticides in codling moth, Cydia pomonella L. from OregonArshad, Muhammad, 1958- 18 July 1996 (has links)
Toxicological studies were carried out to evaluate the
susceptibility of codling moth, Cydia pomonella L. to
different insecticides. Bioassay procedures for adults and
larvae were standardized in terms of posttreatment holding
and temperature, age and sex of insects, insecticide
formulations and selection of a reference strain.
This study detected a low level of resistance to
azinphosmethyl in codling moth from Oregon. The LD50 value
of the most susceptible strain was 0.038 ug AI/moth, while
that of the most resistant population was approximately 4.3
times higher as determined by the topical application
method on pheromone traps. The adult topical bioassay using
moths reared in the laboratory showed that two of the seven
strains tested (Crippens and Medford) had 4-5 fold higher
LD50 values than reference (Saint Cloud) strain. In the
topical and residual studies with first instar larvae,
similar but slightly lower differences were observed among
the different populations.
There was a strong indication of low levels of
resistance in populations to diazinon and fenvalerate in
topical tests applied to both males and females. However,
there was no significant difference for carbaryl or
endosulfan. Larval topical bioassays showed a significant
difference only to diazinon. Correlation analysis suggests
that a degree of cross-resistance exists between
azinphosmethyl and diazinon and to some extent to
fenvalerate.
Codling moths exposed to the residues of diflubenzuron
showed a maximum of 2-fold difference between the
susceptible and resistant populations. The differences were
visible in terms of egg hatch and first instar larval
entries. The pupal and adult stages emerging from the
treated apples exposed to ovipositing females showed
insignificant sublethal effects. A strong positive
correlation between the resistance to azinphosmethyl and
resistance to diflubenzuron was noticed. Selection of
codling moths for resistance to diflubenzuron for six
generations in the laboratory decreased susceptibility by
5-fold.
Application of synergists such as PBO and DEF,
combined with azinphosmethyl and diflubenzuron, showed
slightly different effects on all strains of codling moth.
Use of PBO (a P-450 inhibiting compound) with
azinphosmethyl and diflubenzuron did not change toxicity of
either of the compounds. However, the combination of DEF (an esterase inhibiting compound) with the insecticides
significantly increased the toxicity of azinphosmethyl and
to some extent diflubenzuron. The maximum synergistic
ratios obtained were 8 and 2 for azinphosmethyl and
diflubenzuron, respectively. These results indicate a
possible involvement of esterases in development of
resistance in codling moth to azinphosmethyl and maybe to
diflubenzuron. The optimal synergistic ratio determined on
a resistant strain of codling moth to various combinations
of azinphosmethyl and DEF was 1:4 (50 ppm of azinphosmethyl
200 ppm of DEF). The phytotoxicity studies on young apple
trees showed that DEF should be used at or below 500 ppm to
avoid phytotoxicity while maintaining effective control of
codling moth with a reduced dose of azinphosmethyl. / Graduation date: 1997
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Larval feeding preferences and their consequences for the gypsy moth in southern QuébecMauffette, Yves. January 1982 (has links)
No description available.
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Maternal influences on size in the Cinnabar mothRichards, Laura Jean January 1978 (has links)
Genetic and non-genetic effects of maternal; size were investigated in four introduced populations of Cinnabar moth Tyria jacobaeae (L.) (Arctiidae). Offspring of different female moths were reared to the pupal stage under greenhouse conditions with an overabundance of food. Mean offspring-maternal size correlations were highest for second generation laboratory offspring using pupal weight as the size criterion, maximum egg weight was not related to female size, although average egg weight tended to decrease, and fecundity increase with female wing length. Egg weight was not related to final pupal weight. Egg weight decreased over the oviposition period, but pupae reared from later batches were not consistently of lower weight when compared with pupae reared from batches laid on tie first day of oviposition. Under a less favorable temperature regime, hatching, success was reduced in later batches. It was concluded that maternal effects (genetic and non-genetic) on offspring size are unimportant under normal field conditions in comparison to the effects exerted by larval crowding and food availability. However under very poor conditions, selective mortality may be imposed on later batches, or on the lighter eggs of large moths. / Science, Faculty of / Zoology, Department of / Graduate
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Larval feeding preferences and their consequences for the gypsy moth in southern QuébecMauffette, Yves. January 1982 (has links)
No description available.
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Some aspects of the relationship between two strains of Plodia interpunctella (Hubner) and their granulosis virus : With particular reference to their biology, mechanisms of inheritance of resistance and response to exposure to lethal and non-lethal dosesVigneswaren, K. January 1985 (has links)
No description available.
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Mechanisms of insecticide resistance in Heliothis armigera (Huebner) (Lepidoptera : Noctuidae)Ahmad, M. January 1988 (has links)
No description available.
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Studies on the sterile male technique for the control of the tropical warehouse moth, Ephestia cautellaMakee, H. January 1989 (has links)
No description available.
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Natural mortalities of Euproctis chrysorrhoea (L.) and the use of its baculovirus in biocontrolSterling, Philip Howard January 1989 (has links)
No description available.
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Initial investigation of Trichogrammatoidea lutea (Hymenoptera: Trichogrammatidae) as biological control agent of codling moth Cydia pomonella (Lepidoptera: Tortricidae), in apple and pear orchards, under sterile insect technique (SIT) /Wahner, Nadine. January 2008 (has links)
Thesis (MScAgric)--University of Stellenbosch, 2008. / Bibliography. Also available via the Internet.
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