AboutJohn Cawly Expertise I can help with identification and possible treatment of plant diseases that affect houseplants and horticultural species, to include both biological (fungal, bacterial, viral, parasitic etc.) and environmental/cultural (watering, potting media, etc.) aspects.
Experience Practical experience with a wide variety of houseplants and greenhouse plants, including cacti, euphorbia, african violets, amaryllus, and many others.
Organizations American Phytopathology Society
American Society of Plant Biologists
American Society for Virology
Publications Molecular Plant Microbe Interactions
Proceedings of the National Academy of Science (in print)
Rhodora -- Journal of the New England Botanical Society
Allelopathy Journal
Education/Credentials BS, Southern Illinois University - Biological Sciences MS, Southern Illinois University -- Biological Sciences - Genetic Engineering Specialization PhD, University of Missouri Columbia -- Plant Microbiology and Pathology (Viral Diseases specialization/Biotechnology Emphasis)
Question hi dear expert,
i want to ask if Permethrin ( C21H20Cl2O3 ) is efficent against green aphis of pomegranate tree or not? if no please introduce me an efficent method against this type of insect. i have to say that i can't do spraying poison in large area because i have a little garden and a lot of neighbors that don't want to spray poison on their trees. ok?
I attached a photo to my email and sent it to you as you told.
please help me dear proffessor
thanks
Answer Hi Amir,
There are many methods that can be used to control aphid populations. Some are as simple as spraying with a powerful water hose. Many people encourage beneficial insects such as ladybird beetles (in North America, that is). If you are wanting an insecticide, I would suggest that you try to find an organic insecticide such as pyrethrin based compounds. These are better to use than the synthetic ones. They are harmful to fish, but are far less toxic to mammals and birds than many synthetic insecticides. They are non-persistent, being biodegradable, and also break down easily on exposure to light or oxygen. They are considered to be amongst the safest insecticides for use around food. For humans, pyrethrin is known to irritate eyes, skin, and respiratory systems and is particularly harmful to aquatic life.
The are a natural product found in some plant species. They should be applied with the directions accompanying the product. Check your local ordinances as many products have been regulated over the past several years.
