important crops for commercial production. R. solani AG4 causes crown and root rots on ornamentals including petunia ( Wright et al., 2004 ) and impatiens ( Diab et al., 2003 ; Honeycutt and Benson, 2001 ). The high cost of chemical treatments and label
, the blueberry plant’s crown and root system is established in three strata: mulch, mulch-incorporated soil, and tilled native soil. In vineyard and afforestation systems, plants typically are established in disturbed mineral soils with no amendments or
Phytophthora crown and root rot (PCRR) is among the most serious diseases of Persian walnut worldwide. In California, more than 10 species of Phytophthora have been implicated in the disease, but Phytophthora cinnamomi and P. citricola are
collar diameter were measured at planting. Thereafter, these variables and including bole height, crown depth, and spread were recorded every 3 months. Data analyses. Continuous data such as tree height, root collar diameter, diameter at breadth height
four turnip cultivars: ‘Just Right’ (JR; Jordan's Seed, Woodbury, MN), ‘Purple Top’ (PT; Jordan's Seed), ‘Royal Crown’ (RC; Sakata Seed America, Inc., Morgan Hill, CA), and ‘Scarlet Queen’ (SQ; Johnny's Seeds, Winslow, ME). These genotypes were chosen
crown and had a higher root-to-shoot ratio with sawdust mulch than with black weed mat ( Larco et al., 2013 ). Sawdust mulch insulates the soil from temperature fluctuations and adds organic matter as it decomposes ( Strik et al., 2017a , 2019 ; White
One-year-old crowns of Asparagus officinalis L. cv. Princeville were grown for up to 2 years in pots containing a mineral soil. Nitrogen concentrations ranged from O to 340 kg N/ha. Increasing N fertilizer level resulted in a decrease in total crown fructose concentration and an increase in fern growth, both leveling off at higher N levels. Crown growth was maximized at intermediate N levels. To obtain maximum crown growth and total fructose concentration, while avoiding the excessive fern growth associated with higher N fertilizer levels, ≈57 kg N/ha should be applied to asparagus during the 2nd and 3rd years of growth.
-over peat field of St-Bonaventure peatland. Total survival (percent), height (centimeters), and crown width (centimeters) of the plants were measured on 26 Aug. 2005. The height had also been measured previously on 11 Aug. 2004 to calculate the growth in
evaluated in the field on 30 Mar. and 13 Apr. 2013 and 16 Apr. 2014. The degree of damage assessment was taken for each plant in the BP treatment, and the results were averaged by plot. The criteria were 0 = no growing point from the group of crowns from one
Foliar sprays of increasing concentrations (0, 75, 150, 300, 600, and 1200 mg·liter-1) of paclobutrazol were applied to `Cardinal' strawberry plants (Fragaria × ananassa Duch.) 35 days after transplanting. The plants were established in August in cultivated plots for measurement of paclobutrazol effects on first year growth or in a double-row hill system on black polyethylene-covered raised beds for 2nd year measurements. Increasing the paclobutrazol concentration reduced the number of runners, decreased runner length, and limited biomass partitioned into daughter plants. By the end of the first growing season, paclobutrazol had increased lateral crown development but reduced leaf area per treated plant. Root growth was reduced by concentrations >600 mg·liter-1. Treatment with 75 to 300 mg·liter-1 increased total plant dry weight by 33% to 46%. The following spring, plant growth was decreased by ≥ 300 mg·liter-1. Yield was increased by all treatments, except 1200 mg·liter-1. Leaf net photosynthesis increased within 12 days after treatment with paclobutrazol and was higher than in the controls the next summer. Leaf stomata1 conductance also increased the first year and was significantly higher the 2nd year after treatment. The optimum concentration of paclobutrazol for strawberries appears to be between 150 and 300 mg·liter-1.