page 1

Opportunities for Interchange - Summaries of Selected International Avocado Research

Reuben Hofshi

Del Rey Avocado Company, Fallbrook , CA

genetic resources, germplasm, international

pages 1- 2

Conservation of Avocado Genetic Resources in Mexico

Alejandro Barrientos-Priego

Dept. de Fitotecnia, Universidad Autónoma Chapingo, Chapingo, México

conservation, environmental adaptability, genetic resources, Persea, Phytophthora

pages 2 - 5

Avocado Production in South Africa and Research at Merensky Technological Services

J. Stefan Köhne

Merensky Technological Services, Westfalia Estate, Duivelskloof , South Africa

South Africa, Westfalia Estate, phosphorous acid, clonal rootstock, root rot, research, fruit quality, Phytophthora

pages 5 - 7

Avocado Nutrition

Emi Lahav

Dept. of Horticulture, ARO, Volcani Center , Bet Dagan , Israel

nutrient removal, leaf analysis, nitrogen, potassium, phosphorus, yield

pages 7 - 8

Improving Avocado Orchard Yield Through the Use of Pruning and Girdling

Miriam Zilberstaine and Eli Kaluski

Extension Services, Ministry of Agriculture, Hadera , Israel

girdling, pruning, light penetration, canopy management, tree shape, yield, rejuvenation

pages 8 - 9

Avocado Canopies: A New Zealand Perspective

Grant Thorp

HortResearch, Mt. Albert Research Center , New Zealand

tree size, light penetration, pruning, yield, single leader, dwarfing rootstock, rejuvenation

pages 9 - 13

High-Density Avocado Planting - An Argument for Replanting Trees

Reuben Hofshi

Del Rey Avocado Company, Fallbrook , CA

high density, canopy management, light penetration, tree spacing, tree replacement, planting density, rejuvenation, productivity

pages 13 - 15

Should Avocado Growers Consider A "Nursery Cooperative"?

Reuben Hofshi

Del Rey Avocado Company, Fallbrook , CA

clonal rootstocks, etiolation, nurse seed,  cloning, phytophthora, establishment cost, cloning, nursery, cooperative

page 16 - 18

Update on the Economic Impact of Mediterranean Fruit Fly on California Agriculture

Jerry Siebert

Dept. of Agricultural and Resource Economics and Policy, UC Berkeley , CA

Mediterranean Fruit Fly, economic impact, USDA, CDFA, quarantine, malathion bait, trade, embargo

pages 18 - 22

Use of Lime-Sulfur Solution for Control of Postharvest Mold of Citrus Fruit

Joseph Smi lani ck

USDA-ARS, Horticultural Crops Research Laboratory, Parlier, CA

David Sorenson

Sunkist Growers, Technical Services, Lindsay , CA

Lime sulfur, green mold, blue mold, Penicillium, citrus, Postharvest , fruit decay, fungicide, inoculation

page 23

Potential Problems with Gibberellic Acid Applications to Citrus

Ben Faber

UCCE Farm Advisor, Ventura County , CA

Citrus, fruit quality, gibberellic acid, rind quality, 2,4-D, fruit drop

pages 24 - 25

Boron is High in Many Southern San Joaquin Valley Citrus Trees

Craig Kallsen

UCCE Farm Advisor, Kern County , CA

Citrus, boron, leaf analysis, toxicity

pages 25 - 29

Considerations Relative to Establishment of Clementine Mandarins

Etienne Rabe

Dept. of Horticulture, University of Stellenbosch , South Africa

Clementine, mandarins, pruning, plant growth regulators, Spain, Morocco, South Africa, compatability, gibberellic acid, climactic requirements

pages 27 - 29

After December's Freeze, Gear Up for Additional Releases of Bio Control

Phil A. Phillips

IPM Regional Advisor, UCCE, Ventura County , CA

Freeze, biocontrol, beneficials, pest control, citrus, Aphytis, California Red Scale

page 30

Does Applying All of the Season's Nitrogen Early in the Season Promote Earlier Fruit Maturity?

Craig Kallsen

UCCE Farm Advisor, Kern County , CA

Nitrogen, citrus, fruit maturity, leaf analysis

page 31

New Subtropical Cooperative Extension Specialist/Horticulturist at the University of California , Riverside

Chih-Cheng (Thomas) Chao

Dept. of Botany and Plant Sciences, UC Riverside, CA