EFFECTS OF POLLEN LOAD ON PISTILLATE FLOWER ABSCISSION (PFA) OF ENGLISH WALNUT UNDER FIELD CONDITIONS
نویسندگان
چکیده
منابع مشابه
Pistillate Flower Abscission (pfa)
PFA was not different with shaded vs. exposed limbs of the same trees nor between shaded interior trees and outside ones with high light exposure. Tehama trees expressed lower PFA than adjacent Serre PFA of Tehama was also low at a site where Serr trees (removed 1982) had very high drop the previous three years. Fruitfulness of all monitored limbs in 1982 ranged from 6 to 97% and the earlier co...
متن کاملPistillate Flower Abscission - 1990
Evaluation of the pistillate flower abscission (PFA) potential of UC-67-13 and UC-67-11 was continued at two sites. At a high PFA site UC-67-13 PFA was only moderately lower than Serr for the third year. UC-67-11 demonstrated low PFA potential for a seconq year at this site. Higher PFA potential of UC-67-13 than UC-67 -11 was also found at a second site for a second year. No further evaluation ...
متن کاملPollen and Pistillate Flowerabscission
The objective of this year's work was to confirm the role of pollen in pistillate flower abscission (PFA) of Serr walnut. Pistillate flower abscission was evaluated in individual trees along transects, beginning close to po11enizers and extending up to 640 feet away, in 12 orchards. It was also evaluated in controlled pollinations of bagged and unbagged Serr flowers with varying levels of Serr ...
متن کاملWalnut Pollination and Pistillate Flower Abortion
This year’s research focused on further evaluation of potential alternate bearing with multiple year ReTainTM treatments. After three years of treatment with ReTainTM, there does not appear to be any negative effect on yield. There was a lower reduction in PFA than was expected, but this is thought to be unrelated to multiple year treatments. Treatment of a Chandler orchard with ReTainTM was do...
متن کاملEvaluation of Retain for Reducing Pistillate Flower Abortion and Increasing Yield in ‘serr’ Walnuts
Pistillate flower abortion (PFA) is the loss of nut-producing pistillate flowers early in the season, typically 2 to 3 weeks after bloom. PFA is the principal factor limiting productivity in ‘Serr’ walnut while affecting other cultivars to lesser and varying degrees. Research by Vito Polito at UC Davis showed that excessive pollen tubes growing down the style of the walnut pistillate flower pro...
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ژورنال
عنوان ژورنال: HortScience
سال: 1992
ISSN: 0018-5345,2327-9834
DOI: 10.21273/hortsci.27.6.619c