Christof Stumpf | LSU Alexandria (original) (raw)

Papers by Christof Stumpf

$Research paper thumbnail of First record of \u3ci\u3eDactylopius confusus\u3c/i\u3e (Cockerell, 1929) (Hemiptera: Coccomorpha: Dactylopiidae) in Michoacan, Mexico$

In April 2017, several scale insect specimens in the family Dactylopiidae were collected from inf... more In April 2017, several scale insect specimens in the family Dactylopiidae were collected from infested cladodes of wild Opuntia tomentosa Salm-Dyck, 1822 (Cactaceae) in the outskirts of Morelia City, Michoacan, Mexico. The specimens were identified as Dactylopius confusus (Cockerell, 1929) (Hemiptera: Coccomorpha: Dactylopiidae). In this article, the presence of D. confusus in Michoacan state, Mexico, is recorded for the first time. A subsequent finding of D. confusus on Opuntia ficus-indica (L.) Mill., (1768) (Cactaceae) in October 2019 was confirmed with 18S rDNA and 28S rDNA

Cortez-Madrigal, Hipolito, Ramírez-Cruz, Arturo, Stumpf, Christof F. (2020): First record of Plan... more Cortez-Madrigal, Hipolito, Ramírez-Cruz, Arturo, Stumpf, Christof F. (2020): First record of Planchonia stentae (Brain, 1920) (Hemiptera: Coccomorpha: Asterolecaniidae) on Asclepias curassavica Linnaeus, 1753 (Gentianales: Asclepiadaceae) in Mexico, with observations on parasitic Encyrtidae. Insecta Mundi 2020 (782): 1-6, DOI: http://doi.org/10.5281/zenodo.5754781

$Research paper thumbnail of First record of \u3ci\u3ePlanchonia stentae\u3c/i\u3e (Brain, 1920) (Hemiptera: Coccomorpha: Asterolecaniidae) on \u3ci\u3eAsclepias curassavica\u3c/i\u3e Linnaeus, 1753 (Gentianales: Asclepiadaceae) in Mexico, with observations on parasitic Encyrtidae$

In April 2018, specimens of an asterolecaniid were collected on infested wild plants of Asclepias... more In April 2018, specimens of an asterolecaniid were collected on infested wild plants of Asclepias curassavica Linnaeus, 1753 (Gentianales: Asclepiadaceae) in Jiquilpan, Michoacan, Mexico. The collected specimens were identified as Planchonia stentae (Brain, 1920) (Hemiptera: Asterolecaniidae). In this paper, we record for the first time the presence of P. stentae infesting A. curassavica in Mexico

Arthropod Management Tests, 2013

Advances in Biology Laboratory Education, 2020

Molecular Biology Reports, 2019

Pesticide Biochemistry and Physiology, 2010

Pesticide Biochemistry and Physiology, 2007

Novel acylpyridinium salt chemistry and directed lithiation methodology was developed to add for ... more Novel acylpyridinium salt chemistry and directed lithiation methodology was developed to add for the first time substitutions directly to the phenylpyridine heterocyclic ring of nicotine. A variety of 3-(1-methylpyrrolidin-2-yl)-4-(alkyl, aromatic, heterocyclic and silanyl) and -N-alkyl pyridines were synthesized (compounds 1–9). In vial tests with the green peach aphid, Myzus persicae, compounds 1–4 were 1.1, 1.8, 2.3 and 1.9×, respectively, more

Journal of Medical Entomology, 2008

For &amp;gt;50 yr, N,N-diethyl-3-methylbenzamide (deet) has been the standard for arthrop... more For &amp;gt;50 yr, N,N-diethyl-3-methylbenzamide (deet) has been the standard for arthropod repellents and has been an important tool to protect people from disease agents carried by ticks, mosquitoes, and other arthropods. However, some people avoid using deet because of concerns about adverse health effects. In 2007, a new repellent, BioUD, with the active ingredient 7.75% 2-undecanone, originally derived from wild tomato (Lycopersicon hirsutum Dunal f. glabratum C. H. Müll) plants, was registered by the U.S. Environmental Protection Agency. In the current study, repellent efficacy of BioUD was compared using arm-in-cage studies with 7 and 15% deet against the mosquitoes Aedes aegypti (L.) and Aedes albopictus Skuse. No differences were found in mean repellency over 6 h after application between BioUD versus 7 and 15% deet for Ae albopictus. For Ae. aegypti, no differences were found over the same time period for 7% deet. Compared with 15% deet, BioUD mean repellency was lower over the 6-h test period. Human subject field trials were conducted in North Carolina, United States, and Ontario, Canada, comparing the repellency of BioUD to products containing 25 and 30% deet. BioUD provided the same repellency or was more efficacious than 25 and 30% deet, respectively, in these studies. Laboratory trials were conducted to determine the repellent activity of BioUD against the American dog tick, Dermacentor variabilis (Say), on human skin and cloth. BioUD repelled ticks at least 2.5 h after application to human skin. On cloth, no differences in mean repellency were found through 8 d after application between BioUD and 7% deet. In a two-choice test for BioUD versus 15% deet on filter paper, ticks spent significantly more time on the deet-treated surface than the BioUD-treated surface. Based on these studies in toto, BioUD is an efficacious alternative to deet in its repellent activity.

Entomologia Experimentalis et Applicata, 2005

ABSTRACT

Ramírez-Cruz, Arturo, González-Hernández, Héctor, Stumpf, Christof F. (2020): First record of Dac... more Ramírez-Cruz, Arturo, González-Hernández, Héctor, Stumpf, Christof F. (2020): First record of Dactylopius confusus (Cockerell, 1929) (Hemiptera: Coccomorpha: Dactylopiidae) in Michoacan, Mexico. Insecta Mundi 2020 (761): 1-7, DOI: http://doi.org/10.5281/zenodo.4646025

Arthropod Management Tests, 2014

has been the standard for arthropod repellents and has been an important tool to protect people f... more has been the standard for arthropod repellents and has been an important tool to protect people from disease agents carried by ticks, mosquitoes, and other arthropods. However, some people avoid using deet because of concerns about adverse health effects. In 2007, a new repellent, BioUD, with the active ingredient 7.75% 2-undecanone, originally derived from wild tomato (Lycopersicon hirsutum Dunal f. glabratum C. H. Mü ll) plants, was registered by the U.S. Environmental Protection Agency. In the current study, repellent efÞcacy of BioUD was compared using arm-in-cage studies with 7 and 15% deet against the mosquitoes Aedes aegypti (L.) and Aedes albopictus Skuse. No differences were found in mean repellency over 6 h after application between BioUD versus 7 and 15% deet for Ae albopictus. For Ae. aegypti, no differences were found over the same time period for 7% deet. Compared with 15% deet, BioUD mean repellency was lower over the 6-h test period. Human subject Þeld trials were conducted in North Carolina, United States, and Ontario, Canada, comparing the repellency of BioUD to products containing 25 and 30% deet. BioUD provided the same repellency or was more efÞcacious than 25 and 30% deet, respectively, in these studies. Laboratory trials were conducted to determine the repellent activity of BioUD against the American dog tick, Dermacentor variabilis (Say), on human skin and cloth. BioUD repelled ticks at least 2.5 h after application to human skin. On cloth, no differences in mean repellency were found through 8 d after application between BioUD and 7% deet. In a two-choice test for BioUD versus 15% deet on Þlter paper, ticks spent signiÞcantly more time on the deet-treated surface than the BioUD-treated surface. Based on these studies in toto, BioUD is an efÞcacious alternative to deet in its repellent activity.