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Nitrogen is one nutrient that generally needs to be added regularly to stone fruit orchards in California. It should be managed carefully as both deficiency and excess can cause problems. Deficiency symptoms include a lack of growth and yellow or pale green leaves.
In 1987, David Ramming of USDA and Ted DeJong and Scott Johnson of UC collaborated on a rootstock evaluation project for peaches and plums. David had bred or collected over 100 items including many Prunus species and hybrids.
Potassium deficiency can occasionally be found in California peach and nectarine orchards, especially in sites that have been leveled and the top soil has been removed. Symptoms include pale green or yellow leaves that develop in late summer. Often the leaves are rolled.
NC-140 is a group of scientists from over 30 locations within the USA, Canada and Mexico who cooperate on rootstock trials for peaches, apples, cherries and pears. Each trial is replicated in at least 5, and often as many as 20 locations.
Ten rootstocks were evaluated in this NC-140 peach trial planted in 1984 at Kearney. Redhaven was the scion variety and the planting was maintained through the 1990 season. Rootstocks: Bailey Citation Damas 1869 GF 655/2 (St.
California did not participate in this rootstock trial that included 19 items planted in 20 locations. The selections focused on cold hardiness and did not include dwarfing stocks. These rootstocks have not shown much promise for California growers.
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.
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.
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.
