Ask a Question
Notify Me On Question Update
Email this Question
I have been spraying Captan on my fruit trees for several years. This year I discovered at IFA that Captan is no longer allowed, so I purchased malathion (57%). Is there any problem spraying the malathion over the Captan? It has been three weeks since the last spray of Captan. I'd like to spray tomorrow (7/30), so it would be helpful to know as soon as possible.
Rate This FAQ
Captan is a fungicide and primarily for control of apple scab, black rot, lotch, Botrytis blossom infection. Malathion is one of several
insecticides used for control of codling moth. So they have very different functions - malathion is not a fungicide. I have copied a section below about Captan which states it should not be used with lime or other alkaline materials or with oil within 4 days. Malathion is often prepared in an oil solution so caution should be used if timing is too close to last Captan spray. My question for you is what are you treating your fruit trees for??
It is best to use an appropriate chemical when you have identified the pest, generally we do not recommend spraying as a preventative.
For more information on apple codling moth, here is the link to USU Fact
Sheet on codling moth
There also is information at USU Extension website for more information on Integrated Pest Management is a strategic approach to plant and animal care that seeks to suppress pest populations while minimizing pest control costs and environmental disruption.
Captan 50W or 80W formulations are used at 6.0-8.0 lb/A of Captan 50W or 3.75-5.0 lb/A of Captan 80W, for control of diseases on apple; other formulations should be used according to label direction. On apples Captan has proven effective in the control of apple scab, black rot, Brooks spot, Botryosphaeria rot, blotch, bitter rot, Botrytis blossom infection, fly speck, and sooty blotch. Captan=s residual life is elatively short, consequently, sooty blotch, fly speck, and fruit rot control may not be satisfactory where sprays are discontinued more than 3 weeks prior to harvest. The higher indicated rates are for severe summer disease pressure.
Captan may produce frogeye-like spotting of the foliage of Delicious, Stayman, and Winesap early in the season. The small spots do not enlarge and are no cause for alarm. The inclusion of sulfur in the spray mixture may increase this type of injury.
Captan should not be used with lime or other alkaline materials. Do not use it with oil or within four days of an oil spray. Do not use in
combination with EC formulations of parathion. Captan should be used with caution in bloom sprays, especially on varieties which are hard to pollinate (e.g. Red Delicious). Captan has been shown to severely reduce pollen viability for 24 - 48 hours after application.
Although new Captan labels permit application to apples up to the day of harvest, Captan has a 4-day re-entry interval which makes pre-harvest application more restrictive. A label exception is made for the last 48 hours of the re-entry interval during which workers may enter the treated area to perform hand labor or other tasks involving contact with anything that has been treated, without time limit, if they wear ll of the following: coveralls, waterproof gloves, shoes and socks, and protective eye wear. http://www.caf.wvu.edu/kearneysville/profile/critfung.htm
Submit Your Suggestion
Other Questions In This Topic
- Can we grow the new Honey Crisp apple here?
- How do I prune cherry trees?
- I seem to have terrible luck with cherry trees. I have 2 questions. first, Since they have taken away Diazinon as a root borer killer, how do I manage root borer? Second, I live in the city and have irrigation water going to my yard and garden. How do I water them. I'm afraid one tree, that sits to the back of my garden is getting a lot of water when I flood my tomatoes. Do they not like flooding. How can I protect this tree? How should I water my other cherry trees planted away from my veg garden. I got two montmaurancy trees last year and they both died. I love cherry trees and I need HELP
- I have a 6year old dwarf braeburn apple tree. It has gotten very tall and a large part of the tree split off in a windstorm. I need to prune it back and am wondering when I can safely do so.
- Where do cherry trees grow in Utah?
- We have scrub oak in our back yard. Almost overnight we have thousands of little green worms that have made webs over the leaves of the trees and are eating every green leaf in sight! Help! What do we do???
- What is the proper time to fertilize fruit trees? Also, is there only one appropriate time of year to prune fruit trees?
- When I first moved here, my peach tree was unhealthy and barely alive. With regular irrigation from the water that comes down from Cedar Breaks National Monument and all the minerals, it has become very healthy with good fruit. Now it looks like it used to - fruit, but hardly any leaves. Could it be the drastic changes in weather one week in April after Easter - 75 degrees one day, gale force winds the next, then freezing rain and snow, all during bloom time?