Publications by authors named "I Denholm"
Soils and plant root rhizospheres have diverse microorganism profiles. Components of this naturally occurring microbiome, arbuscular mycorrhizal (AM) fungi and plant growth promoting rhizobacteria (PGPR), may be beneficial to plant growth. Supplementary application to host plants of AM fungi and PGPR either as single species or multiple species inoculants has the potential to enhance this symbiotic relationship further.
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- The aphid Myzus persicae is a major agricultural pest known for quickly developing resistance to insecticides, making it a challenge for farmers.
- Researchers generated a comprehensive genome assembly and sequenced over 110 clonal lines from worldwide populations to study the genetic basis of this resistance.
- The study found significant genetic diversity in resistance mutations influenced by the aphid's host plants, revealing both repeated mutations at the same genetic locus and new resistance mechanisms, which can inform better pest control strategies.
Arbuscular mycorrhizal (AM) fungi are one of the most common fungal organisms to exist in symbiosis with terrestrial plants, facilitating the growth and maintenance of arable crops. Wheat has been studied extensively for AM fungal symbiosis using the carcinogen trypan blue as the identifying stain for fungal components, namely arbuscles, vesicles and hyphal structures. The present study uses Sheaffer blue ink with a lower risk as an alternative to this carcinogenic stain.
View Article and Find Full Text PDFAn international team of scientists and veterinarians was assembled in 1999 to develop a monitoring program to determine the susceptibility of cat fleas, Ctenocephalides felis felis (Bouché) (Siphonaptera: Pulicidae), to imidacloprid. Cat flea eggs were collected, shipped to laboratories, and tested for their susceptibility to imidacloprid. Over 3,000 C.
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- The R81T mutation, which leads to resistance against neonicotinoid insecticides in the aphid species Myzus persicae, has spread notably through southern Europe and was recently studied in Tunisia.
- In Tunisia, the mutation was found at significant levels (32-55%) in northern regions but was less common in the south, appearing in aphids from key crops like peach, potato, and tomato.
- This finding marks the first detection of the R81T mutation in North Africa and highlights a threat to effective aphid control, necessitating further research into the management of resistant populations.