Current-year and Subsequent-year Effects of Crop-load Manipulation and Epicormic-shoot Removal on Distribution of Long, Short and Epicormic Shoot Growth in Prunus persica

The present investigation was carried out on 12-year old trees of nectarine (Prunus persica (L.) Batsch var. nucipersica) cultivar May Fire raised on wild peach seedling rootstocks, Farmer’s orchard at Kotla- Barog in District Sirmour during the years 2014 and 2015. In this experiment, experimental trees were subjected to seventeen different treatments;T1: Pruning to retain 60 fruiting shoots tree-1 (control), T2: Pruning to retain 50 fruiting shoots tree-1, T3: Pruning to retain 40 fruiting shoots tree-1 ,T4: NAA 40 ppm, 2 WAPF (week after petal fall) ,T5: Ethrel 300 ppm, 2 WAPF, T6: GA3 100 ppm, 4 WAPF, T7: GA3 200 ppm, 4WAPF, T8: GA3 100 ppm, 6 WAPF T9: GA3 200 ppm, 6 WAPF, T10: Pruning to retain 50 fruiting shoots tree-1 + NAA 40 ppm (T4), T11: Pruning to retain 50 fruiting shoots tree-1 + Ethrel 300ppm (T5), T12: Pruning to retain 50 fruiting shoots tree-1 + GA3100 ppm (T6), T13: Pruning to retain 50 fruiting shoots tree-1 + GA3 100 ppm (T8),T14: Pruning to retain 40 fruiting shoots tree-1 + NAA 40 ppm (T4), T15: Pruning to retain 40 fruiting shoots tree -1 +Ethrel 300 ppm (T5),T16: Pruning to retain 40 fruiting shoots tree -1 + GA3 100 ppm (T6), T17: Pruning to retain 40 fruiting shoots tree -1 + GA3 100 ppm (T8), pertaining to alternative approach to chemical thinning, chemical thinner were more effective in improving the production of superior grade fruits than reducing the crop load directly by pruning or indirectly by GA 3 (Gibberellic Acid) treatments. Treatments with NAA (naphthalene acetic acid) at 40 ppm when applied two weeks after petal fall reduced the crop load to the greatest extent and improve the yield of superior grade fruits and increase the leaf to fruit ratio and decrease the fruit drop. Pruning to retain 40 fruiting shoots tree-1 + NAA 40 ppm, 2WAPF increased the shoot growth (160.80, 170.20cm), tree height (3.70,4.50 cm), tree spread (2.84,3.60), leaf area (42.71, 40.63 cm) during both the year. However, effect of chemical were less pronounced on trees subjected to severe pruning.

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Herbicide Effects on Weed Control and Shoot Growth of Young Apple (Malus sylvestris) and Peach (Prunus persica) Trees

Weed Technology ◽

10.1017/s0890037x00028785 ◽

1994 ◽

Vol 8 (4) ◽

pp. 840-848 ◽

Cited By ~ 2

Author(s):

Chester L. Foy ◽

Susan B. Harrison ◽

Harold L. Witt

Keyword(s):

Shoot Growth ◽

Field Experiments ◽

Prunus Persica ◽

Weed Species ◽

Apple Trees ◽

Herbicide Treatments ◽

One Year ◽

Broadleaf Species ◽

Old Trees ◽

Peach Trees

Field experiments were conducted at two locations in Virginia to evaluate the following herbicides: alachlor, diphenamid, diuron, metolachlor, napropamide, norflurazon, oryzalin, oxyfluorfen, paraquat, pendimethalin, and simazine. One experiment involved newly-transplanted apple trees; the others, three in apple and one in peach trees, involved one-year-old trees. Treatments were applied in the spring (mid-April to early-May). Control of annual weed species was excellent with several treatments. A broader spectrum of weeds was controlled in several instances when the preemergence herbicides were used in combinations. Perennial species, particularly broadleaf species and johnsongrass, were released when annual species were suppressed by the herbicides. A rye cover crop in nontreated plots suppressed the growth of weeds. New shoot growth of newly-transplanted apple trees was increased with 3 of 20 herbicide treatments and scion circumference was increased with 11 of 20 herbicide treatments compared to the nontreated control. Growth of one-year-old apple trees was not affected. Scion circumference of one-year-old peach trees was increased with 25 of 33 herbicide treatments.

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The Timing of Canopy and Epicormic shoot growth in Quercus robur L.

Forestry An International Journal of Forest Research ◽

10.1093/forestry/63.3.279 ◽

1990 ◽

Vol 63 (3) ◽

pp. 279-283 ◽

Cited By ~ 3

Author(s):

R. HARMER

Keyword(s):

Quercus Robur ◽

Shoot Growth ◽

Epicormic Shoot

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Root and aerial growth in early-maturing peach trees under two crop load treatments

Spanish Journal of Agricultural Research ◽

10.5424/sjar/2017152-10714 ◽

2017 ◽

Vol 15 (2) ◽

pp. e0803 ◽

Cited By ~ 6

Author(s):

Isabel Abrisqueta ◽

Wenceslao Conejero ◽

Lidia López-Martínez ◽

Juan Vera ◽

M. Carmen Ruiz Sánchez

Keyword(s):

Root Growth ◽

Shoot Growth ◽

Growth Dynamics ◽

Fruit Growth ◽

Growth And Yield ◽

Crop Load ◽

Fruit Thinning ◽

Early Maturing ◽

Peach Trees ◽

High Level

The objectives of the paper were to study the pattern of root growth (measured by minirhizotrons) in relation to trunk, fruit and shoot growth and the effects of crop load on tree growth and yield in peach trees. Two crop load (commercial and low) treatments were applied in a mature early-maturing peach tree orchard growing in Mediterranean conditions. Root growth dynamics were measured using minirhizotrons during one growing season. Shoot, trunk and fruit growth were also measured. At harvest, all fruits were weighed, counted and sized. Roots grew throughout the year but at lower rates during the active fruit growth phase. Root growth was asynchronous with shoot growth, while root and trunk growth rates were highest after harvest, when the canopy was big enough to allocate the photo-assimilates to organs that would ensure the following season’s yield. Shoot and fruit growth was greater in the low crop load treatment and was accompanied by a non-significant increase in root growth. High level of fruit thinning decreased the current yield but the fruits were more marketable because of their greater size.

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Growth Suppression as a Control for Nectarine Pox

HortScience ◽

10.21273/hortsci.26.10.1268 ◽

1991 ◽

Vol 26 (10) ◽

pp. 1268-1270

Author(s):

Tara Auxt Baugher ◽

Stephen S. Miller

Keyword(s):

Nutritional Status ◽

Fruit Quality ◽

Shoot Growth ◽

Prunus Persica ◽

Growth Suppression ◽

Root Pruning ◽

Study Support ◽

Low Levels

A 2-year study was designed to test the effect of four growth-suppressing treatments on the incidence of nectarine [Prunus persica (L.) Batsch] pox, nectarine fruit quality, and the growth and nutritional status of nectarine trees. Root pruning was the only treatment that significantly reduced the incidence of nectarine pox. The percentage of red surface was increased by root pruning, foliar-applied paclobutrazol, and girdling. Root pruning and paclobutrazol suppressed extension shoot growth. Root pruning decreased fruit N, P, K, Mg, Mu, Fe, B, and Zn levels and increased fruit Ca. Results of the study support earlier observations that nectarine pox is associated with excessive shoot growth, excessive levels of fruit N and K, and low levels of fruit Ca. Chemical name used: Beta-[(4-chlorophenyl) methyl] -alpha-(1,1-dimethylethyl)-l-H-1,2,4 -triazole-l-ethanol (paclobutrazol).

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Peach Fruit Weight, Yield, and Crop Value Are Affected by Number of Fruiting Shoots per Tree

HortScience ◽

10.21273/hortsci.38.4.512 ◽

2003 ◽

Vol 38 (4) ◽

pp. 512-514 ◽

Cited By ~ 9

Author(s):

Richard P. Marini

Keyword(s):

Prunus Persica ◽

Fruit Set ◽

Fruit Weight ◽

Peach Fruit ◽

Crop Load ◽

Weight Yield ◽

Thinning Operation ◽

Tree Number ◽

Number Of Shoots

Mature `Norman'peach [Prunus persica (L.) Batsch] trees were dormant pruned to retain a range of fruiting shoots per tree (71 to 250) during 3 years from 1997 to 1999. About 40 days after bloom each year, fruits on all trees were thinned to similar crop loads, so only the number of fruits per shoot varied. Fruit set and number of fruits removed by hand thinning were positively related to number of fruiting shoots retained per tree. Number of fruits harvested per tree was not related to number of shoots per tree, whereas average fruit weight at thinning and at harvest, and crop value per tree were negatively related to the number of shoots retained per tree. These results indicate that commercial peach producers should consider modifying pruning and thinning strategies. Rather than retaining a large number of fruiting shoots per tree and hand thinning to distribute fruits every 15 to 20 cm along each fruiting shoot, producers should first determine the number of fruits that trees of a given cultivar can adequately size and then perform the thinning operation to obtain the desired crop load. The number of fruiting shoots retained per tree during pruning should be one-fifth to one-seventh of the number of fruits desired per tree, so that five to seven fruits per fruiting shoot are retained after hand thinning.

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