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3 > Image 3 of Kentucky fruit notes, vol. 1, No. 10, June, 1939 to July, 1939

Part of Kentucky Agricultural Experiment Station

ee literature up to that time. As we another, has not reached full devel- ml studied the problem of thinning opment. Fertilizationisimpossible led peaches in detail, however, we in such flowers and they drop early, ml found it much more complex than usually within two weeks or so el" we had anticipated. Instead of after bloom. The next drop is limiting our studies to thinning, as sometimes referred to as the non- i ure such, we brought other cultural pollinated drop and includes those ?er- practices, such as thinning and pistils in which fertilization has wl nitrate applications, into the pie- not taken place. Since these , ind ture. In addition to this, we made flowers are more vigorous than r ved a long-time study of fruit hud for- those which fell at the first drop, OW- mation and winter injury to the they persist until the fifth to the . .a~ fruit buds. Growth vigor was also sixth week after bloom. The next ` low found to have a very intimate bear- drop, the so-called June drop, ary ing upon the general problem in- includes for the most part peaches ooil volved in adjusting the crop to the with embryos partly developed. soy- tree. The second and third drops may veet Fruit Bird Killi,ig___eiie ef the overlap somewhat in the time they l edll first things which always has to be fell, bel the Teasen for falllng ls llll reckoned with in the thinning lnlle dlllelene There _lla$ been i ing problem is "rintcr injury to tlie one year 'durmg the time when fruit lmdS_ Dur-mg the time Ot these studies were under way that tiie these studies, there was only one a lale d}`eP ef large Peaelles Was l for seasonthat of 1931when there Serlells ln Selne el"ellal`d$ ln llle A . ists was practically no bud killing. Senlllern Pall ef llle St-te Tlne for . There were other seasons when dl`eP_eanle _en after llle Jllne dl`eP j han ` there was a complete kill and still and IS distinct from le a raw others when enough buds were left The Growth Stages Of thee peaelr ; e ni V for a crop, if conditions were favor- __iri Order to adequately detiiie the able fer e Set- Late freezes Some- llll`lltS of thinning, we have had to tlier tunes reduces the crop still further giyc Same ediisideratitm to tlie : uder after winter killing had lalien lla growth stages in the peach. Using it T igef tell ef the frllll beds- Elberta as an example, we may i ding I lt `lll be Seen lllen that the define the (1) first growth period lf- e til _ `ealllel` aelllally sites ns llle $el as extending up to the time the pit E i tins for llle llllnnlng Prebleln begins to harden at the point. Fol- _ l)CHllS dtI`IlllI`lS its (?Xl[l'1t lll leiyiiig this, there is a period . the fruit bud survival. Viewed of Six gyeeks Or SO when there [E from this angle, thinning can be aiiiiears to be a retarded emerge- 2.- i . used one season after another as a merit gf the fruit in external lj means of correcting the diSt1ibu dimensions, but important interior Z ..;. Q tion of the fruit on the tree or in ehaiigeg are taking place; (3) The Q"_'4_*f.f Ot ` afllllsllllg it within the PYePel` last growth period, terminating in livflfj r limits. the so-called "tinal swell," comes ljg r`i The Nat,,mt D,.0pS__re are on during the end of the season, ltural . iidw faniiliar with tlie tliree di-Ops and it is during this time that the it Which occur in the peach. These glealesl delllallds are made llpell l iegall have been given some study in con- llle ll'ee llel ellly es te Sll`ellgth> but ..__ itions . nection with thinning, and they else as te feed nlalel`lal$ end inga may be defined about as follows: lllelslllle ns on e The first drop includes flowers in Time of T]Ll'7L7li?lg.\Vlth the n the ~ which the pistil, for one reason or growth stages in mind then, it will . 3