Archive Nut, Prune and Olive Programs

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May 2025Archived

 

Field picture submitted by Elizabeth Fichtner

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Fruit Report: Page

2001 Peach Rootstock Trial

The 2001 peach rootstock planting included 8 single tree reps of 15 stocks. The trial was planted at Kearney with Red Top as the scion variety. It was removed after the 2006 season.
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Fruit Report: Page

2002 Peach Rootstock Trial

This trial included 8 trees each of only 8 rootstocks with Redhaven as the scion variety. It was planted in 2002 at Kearney and removed after the 2006 season. Rootstocks: Cadaman (Avimag) Empyrean 2 (Penta) Empyrean 101 (Adesoto 101) Krymsk 1 (VVA 1) Krymsk 2 (VSV 1) Lovell Mr.S.
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Fruit Report: Page

2009 Peach Rootstock Trial

This rootstock trial was planted in 2009 at the Kearney Ag Center with Redhaven as the scion variety. It has 8 single tree reps of each of the 15 rootstocks listed below. The same planting was established in 16 other locations within the USA.
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Fruit Report: Page

Individual Nutrients

The 14 nutrients listed on the right hand side of this page are generally considered the essential soil derived nutrients for all plants. The macro nutrients are needed in much greater quantities than the micro nutrients, but a deficiency in any one of them can cause serious problems.
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Fruit Report: Page

Iron (Fe)

The most common type of iron (Fe) deficiency in California is called iron chlorosis or lime-induced chlorosis. It is not caused by low iron but by high levels of bicarbonate ions (HCO3-) which frequently occur in high pH soils. Bicarbonate interferes with the uptake and use of iron by the plant.
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Fruit Report: Page

Manganese (Mn)

Manganese deficiency is seldom a problem in stone fruit orchards in the San Joaquin Valley of California (survey). In a cool spring, mild symptoms can be seen on some leaves. These usually disappear as soon as the weather warms up.
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Fruit Report: Page

Pollination

Most commercial plum varieties in California require pollen from another variety to set a full crop. Thus, a second variety needs to be planted in the orchard or grafted into trees of the main variety. Beehives also need to be placed in the orchard during bloom.
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Fruit Report: Page

Orchard Establishment

Many things should be considered when planning a new orchard. Variety, rootstock, training system and planting spacing all need to be decided well ahead of time.
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Fruit Report: Page

California Stone Fruit Varieties

Hundreds of stone fruit varieties are grown in the San Joaquin Valley of California and shipped to many locations around the world. This section provides a brief description of the main varieties grown in recent years.
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Fruit Report: Page

Nutrition & Fertilization

Keeping nutrients within a certain range is important for proper tree growth and optimum fruit quality. Both deficiencies and excesses of any nutrient can lead to serious problems.
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