Vincent,
You did not mention the variety you are working with, and it may or may not be relevant. Some varieties adapt well to a multi-pick system where remaining fruit increases in size when the largest are harvested. I suppose drop is a type of harvest. Some variety/rootstock/location combinations seem determined to produce a certain size apple regardless of crop load, rainfall, pruning or thinning. Did you also note vegetative growth of the tree? Some trees for me seem to devote more energy to starting vegetative growth under light crop load and then continue the vegetative growth at the expense of fruit size. A tree that is heavily loaded early may choose not to sprout new shoots and devote all energy to crop. (similar to results of Apogee) Is it plausible that as the number of fruit increase the energy devoted to crop growth increases? Crop load may stress some varieties into a higher output mode. In my experience results from very late hand thinning are VERY variety specific. Ernest Rollins 207-717-7057 Rollins Orchards 262 Dexter Rd Garland, Maine 207-924-3504 www.rollinsorchards.com From: apple-crop-boun...@virtualorchard.net [mailto:apple-crop-boun...@virtualorchard.net] On Behalf Of Vincent Philion Sent: Monday, January 13, 2014 12:12 PM To: Apple-Crop Subject: [apple-crop] Late summer drop and fruit size Hello, Im analyzing some data and I have seemingly contradictory results. Im hoping someone can comment and make sense of this: For a number of randomly selected trees, fruit drop was recorded starting late summer until harvest. For each tree, we recorded total fruit drop (and weight), harvested fruit (and weight) and the total (drop + harvest). As I was looking at the data, I noticed average harvested fruit size (weight/number) was related to Total fruits per tree Nothing strange, until I realized harvested fruit size INCREASED with Total fruit number on tree. As if the fruit dropping left more energy for the remaining fruits to grow? I was expecting harvested fruit size to be smaller on trees that had more total fruit, not the other way around. Im not sure this late natural fruit drop can be compared to very late hand thinning, but does anyone know if fruit size increase can be linked to late thinning (notwithstanding total yield that can go down)? Maybe this is normal? Any comment welcome! Vincent <http://www.irda.qc.ca/assets/client/img/logo.png> <http://www.irda.qc.ca/assets/client/img/logo.png> <http://www.irda.qc.ca/assets/client/img/logo.png> Vincent Philion,M.Sc. agr. Microbiologiste Phytopathologiste pomiculture Institut de recherche et de développement en agro-environnement Research and Development Institute for the Agri-Environment www.irda.qc.ca <http://www.irda.qc.ca/> Centre de recherche 335, Rang des Vingt-Cinq Est Saint-Bruno-de-Montarville (Québec) J3V 0G7 vincent.phil...@irda.qc.ca Bureau: 450 653-7368 poste 350 Cellulaire: 514-623-8275 Skype: VENTURIA Télécopie: 450 653-1927 Verger expérimental 330, Rang des vingt-cinq Est Saint-Bruno-de-Montarville (Québec) J3V 4P6 Téléphone et télécopieur : 450 653-8375 Local pesticide: 450-653-7608 Pour nous trouver, cliquer sur le lien: Laboratoire <https://plus.google.com/113874173074370918274/about?gl=CA&hl=fr-CA> Verger <https://www.google.ca/maps/preview#!q=verger+irda&data=!4m15!2m14!1m13!1s0x 4cc9016b3e604b3d:0x9e4816f2e6bea640!3m8!1m3!1d212357!2d-71.3416925!3d46.8563 685!3m2!1i1324!2i934!4f13.1!4m2!3d45.543389!4d-73.341551> Fiers héritiers du travail des frères Saint-Gabri : http://arboretum8gabrielis.wordpress.com <http://arboretum8gabrielis.wordpress.com/> Like most of the data I deal with, I'm best described as either "zero inflated Poisson", or "zero inflated negative binomial". Anything but "Normal". 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