Morrill


History

‘Morrill' was released in 2010 by Dr. Darrell Sparks at the University of Georgia.  ‘Morrill’ was originally tested as ‘Selection No. 58’ and originated from the cross ‘Wichita’ x ‘Pawnee’.  ‘Morrill’ was released due to its exception kernel quality.

Comments

Trees of ‘Morrill’ were planted along with several early harvest cultivars in 2009.  Seedling trees were planted in the early spring of 2009 and then were 4-flap grafted to the scion variety later that same spring.  Early yields of ‘Morrill’ have been modest, similar to ‘Pawnee’ and less than ‘Byrd’ and ‘Lakota’.  Cluster size of ‘Morrill’ is 2.7, which was lower than ‘Byrd’ and ‘Lakota’, and ‘Morrill’ appears less likely to need crop thinning than these two extremely precocious cultivars.

Nut quality of ‘Morrill’ is excellent.  I don’t think there is any other cultivar that can produce as pretty of a kernel.  The shell is thinner than ‘Pawnee’, but not as thin as ‘Byrd’, and we averaged 62% kernel. Part of the reason the percent kernel is so high is that the dorsal and ventral kernel grooves are very shallow and the bottom of the kernel is flat rather than curved.   Kernel color is normally very good and the nut is easy to shell into complete halves.  This is a nut that you would give someone as a gift if you really wanted to impress them, and should bring a premium price.

As you might expect from its parentage, ‘Morrill’ does not have much resistance to scab.  We saw similar levels of scab on ‘Morrill’ as we did ‘Pawnee’ and it will need a full season of fungicide protection to avoid damage.  Testing in Albany indicates that ‘Morrill’ scabs worse than ‘Byrd’ and scab will be difficult to control in south Georgia.  ‘Morrill’ does not seem to be especially susceptible to black aphids.  Our ‘Morrill’ trees have grown off well and seem to be vigorous.

‘Morrill’ is a type II, protogynous, cultivar with pretty early receptivity.  I think it would be similar to ‘Elliott’ in pollination pattern.  It should match well with ‘Desirable’, ‘Pawnee’, ‘Byrd’, ‘Treadwell’ and ‘Mandan’.

‘Morrill’ is a new cultivar and we are still monitoring its yield and quality.  There are some older trees than ours around the state.  From what I have seen the biggest issues are scab susceptibility low early yields.  However, with a big, high-quality nut like ‘Morrill’, you probably don’t want the tree to over bear.  We would recommend ‘Morrill’ for trial for growers that want a large, high-quality nut and who are able to control scab well in their orchards.

 


Table 1. Yield and quality of ‘Morrill’ over 9 years (2009-2017).

Cultivar Avg. Yield # Nuts / lb. % Kernel Cluster Size 50% Shuck Split
  lbs./tree/year        
Morrill 7 43 62% 2.7 Oct. 9
Pawnee 5 47 56% 2.1 Sept. 10

 


Fig. 1.  Individual tree yield of ‘Morrill’ over 9 years (2009-2017).  Each line indicates the yield of a separate tree.


Table 2. Average pest resistance of test cultivars in a sprayed orchard 2009-2017.

Cultivar Leaf ScabZ Nut ScabY Nut Scabx Black Aphid Damagew
Avg. Avg. Worst Avg.  
Morrill 2.0 1.3 2.2 1.2
Pawnee 1.8 1.0 2.7 1.1
  • z1 = no scab lesions, 2 = a few isolated lesions with restricted growth, 3 = multiple lesions with expanding growth, 4 = stem scab lesions or defoliation.
  • y1 = no scab lesions, 2 = a few lesions with restricted growth, 3 = multiple lesions, 0% to 10% coverage, 4 = 11% to 50% coverage, 5 = 51% to 100% coverage or nut drop. Average damage seen on nuts over the tree.
  • x1 = no scab lesions, 2 = a few lesions with restricted growth, 3 = multiple lesions, 0% to 10% coverage, 4 = 11% to 50% coverage, 5 = 51% to 100% coverage or nut drop. Maximum damage seen on any nut.
  • w1 = no damage, 2 = light chlorotic spotting, 0% to 25% leaves affected, 3 = moderate chlorotic spotting, 26% to 75% chlorotic spotting, 4 = heavy chlorotic spotting, 76% to 100% leaves affected.