Expensive and time-consuming, but I think it works
In our San Jose, California yard we have two half-size apple trees and one standard pear tree. So, think of it as two trees. It takes one gallon of spray mixture to cover them.
For the past five years, I sprayed them once a week, mixing several drops of Cyd-X mixed into a gallon of chlorinated tap water. I stored my Cyd-X in the freezer from September thru April. I was never sure whether this had any effect or whether I was wasting my time. I had codling moths in maybe 30% of the fruit.
This year, starting in I think the middle of May, I started a new bottle of Cyd-X and see that now the instructions say to use distilled water, and maybe a stronger mixture. So I used filtered rainwater (fortunately we got some rain in May) and, when that ran out, distilled water from the supermarket. And I sprayed *twice* a week.
Results were definitely better. Codling moths were in maybe 10% of the early fruit, maybe went up to 20%, and then back down to maybe below 10%. The fact that it went down is encouraging for Cyd-X because, given what I did, I would expect mostly the later generations of codling moths to have been knocked out. And, usually, codling moth damage increases as the summer progresses.
Back in May, I think, I sent a message to the manufacturer asking for their opinion on my regimen but never got a response :(. I think that commercial growers economize by spraying only during the generational peaks, which occur every few weeks. But I don't have the time to research that, with the many microclimates in the average California yard, data from the "county extension" service is going to be useless, as are monitoring traps because last year had traps they only collect a few codling moths during the entire year. In other words, I have no practical way to determine when the peaks are.
Analysis: If eradicating codling moths is your hobby, I recommend this product, and the spraying regimen I used. But the cost is quite high. Adding in the sales tax and 5 gallons of distilled water, the cost for me was $30 per tree per year, plus 40 minutes per week for 12 weeks including the time it takes to fuss with clogged nozzles and cleaning out the sprayer once in a while. If you're growing pears and apples to "save money", you're probably better off cutting down the trees and buying your fruit at the market.
If someone can get recommendations out of the manufacturer for home gardeners, please post them!
Reviewed by Jerry Krinock on 8/11/16