I tend to agree the term 'cover' is becoming archaic in regards to modern fruit growing -
I did look thru some historical references I have handy and in the 1936 Michigan spray calendar the 'first cover' is applied 10 days after petal-fall, with the 'second cover' applied 10 days after the first cover - 'third cover' is then two weeks after that, and 'fourth cover' two weeks after third - the calendar then refers to a 'summer generation' spray, "exact time to be determined each year, usually about Aug 1" with the possibility of one or two more sprays after that "at two week intervals" the 1945 'Spraying Program' extension bulletin from Ohio State breaks the sprays down into 5 periods - Dormant, Pre-Bloom, Calyx Cup, First Cover, and Second Brood or Fourth Cover - under the 'First Cover' period the program lists the first cover spray as 'ten days after petal fall', second cover as 'three weeks after petal fall' and 'third cover' as two weeks after second cover with a note "Watch spray service recommendations for need of an additional cover spray against the first brood of codling moth" if should be noted that backbone materials of these programs were sulfer and lead arsenate - anymore I believe the spraying frequency is more decided by monitoring and complicated by such concepts as Alternate Row Center spraying and such - David Doud grower, IN On Apr 11, 2011, at 3:19 PM, Rye wrote: > Hello all, > > I'm looking over pesticide information and I see a lot of references to first > cover, second cover and third cover and also references to first cover spray, > second cover spray and third cover spray. All references seem to expect the > reader to know what that is. Searching the web I found one reference that > said second cover is 4-6 weeks after petal fall. Another reference seemed to > refer to the number of wet days to get to second cover and that didn't make > any sense to me at all. > > I guess I'm really unclear on what "cover" means in this context. What does > the term refer to? What is being covered at these stages and/or what is > doing the covering? Or what observation do you make and say "ah! we are > reached second cover today!" (same question for first and third.) > > Also, what is the relationship between "second cover" and "second cover > spray"? (same question for first and third) I think I would understand once > I understand what second cover is, but my general confusion on the topic > leaves me with little confidence in that. > > I have found references for definitions of some stages such as green tip, > pre-pink, pink. But these "cover" stages elude me. > > Thanks for sharing your expertise! > > Rye Hefley > Future Farmers Marketer > So. Cal. > > > _______________________________________________ > apple-crop mailing list > apple-crop@virtualorchard.net > http://virtualorchard.net/mailman/listinfo/apple-crop
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