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Lexie McClymont, Ian Goodwin, Desmond Whitfield, Mark O’Connell, and Susanna Turpin

Vegetative growth, orchard productivity, fruit quality and marketable yield were evaluated for rootstock (D6, BP1 and Quince A), tree density (741–4444 trees/ha), and training system (Open Tatura trellis, two-dimensional vertical and three-dimensional traditional) effects on young trees of the blush pear cultivar ‘ANP-0131’. ‘ANP-0131’ is a vigorous scion and vegetative growth, precocity, and yield were influenced by the selected rootstocks. Tree density and training system treatments exerted a substantial effect on canopy radiation interception while increasing tree density improved yield. Increasing tree density from 2222 (high density) to 4444 (ultra-high density) trees/ha did not improve cumulative yield. Crop load affected fruit size, such that “marketable” yield (yield of fruit weighing between 150 and 260 g) was greatest for trees on D6 rootstock and trained to Open Tatura trellis at high and ultra-high densities.

Free access

Guy Witney, Gary Bender, Ben Faber, Rudy Neja, Hodge Black, Neil O'Connell, Nicholas Sakovich, and Mark Freeman

The county farm advisors in California are responsible to develop and distribute county newletters to subtropical fruit farmers. The purpose of these newsletters is to appraise growers of emerging research developments and discuss topics of current importance. There is often repitition of information and duplication of mailing lists resulting in costly and innefficient use of the University's limited resources.

A cooperative effort between the California Avocado Society, the Citrus Research Board, and University of California farm advisors involved with subtropical fruit production has resulted in Subtropical Fruit News. This newsletter greatly improves Cooperative Extension's outreach education programs, makes better use of limited resources, yet retains the identity of each advisor and the county or region they serve. This newsletter should serve as a model for other extension programs looking toward maximizing efficiency.

Free access

Neil V. O'Connell, Craig E. Kallsen, Richard L. Snyder, Blake L. Sanden, Paul W. Giboney, and Mark W. Freeman

Many citrus growers are hesitant to plant cover crops, particularly perennial types, because of possible increased frost hazard. To quantify the increased risk, temperature relations over a 3-year period were compared between areas in a `Valencia' orange orchard with and without a partial perennial cover crop. The partial perennial cover crop consisted of a mowed perennial planting along the double drip line hoses, and an annually fall-replanted unirrigated strip of groundcover in the middle between the tree rows. This partial perennial cover crop increased the frost hazard compared to uncultivated bare ground even when wind machines were operating.