This invention relates to a new cultivar of an apple tree which is scab resistant, and is characterized by a maturity 7 weeks before Delicious and 31/2 weeks before Prima.

This invention is a new and distinct cultivar of apple tree. It was 
discovered by applicants in August, 1971, at Lafayette, Ind., in the 
course of an attempt to develop improved apple trees with high fruit 
quality and resistance to Venturia inaequalis (Cke.) Wint., the casual 
agent for the apple scab disease. The tree is a seedling of known 
parentage planted in 1966 in Block C of the Hinsley Breeding Orchard at 
the Horticultural Farm of the Purdue University Agricultural Experiment 
Station, Lafayette, Ind. In the above orchard, its position was Row 21, 
Tree 200, having the description PRI 2175-7 in our breeding records. 
The present new cultivar, which is designated as Coop 13, is a seedling 
produced from crossing `Raritan` as the seed parent and the seedling PRI 
1018-101 as the pollen parent in 1965 at New Brunswick, N.J. This new 
cultivar carries a genetic factor, V.sub.f, inherited from Malus 
floribunda 821 which causes it to be resistant to infection caused by 
Venturia inaequalis. The presence of this genetic factor has been 
repeatedly proven by controlled inoculation tests in the Purdue greenhouse 
of the seedling and of its offspring produced from controlled crosses. The 
complete pedigree is shown below: 
##STR1## 
The new cultivar produces a vigorous tree with good annual crops. It is 
resistant to scab and moderately resistant to fireblight and powdery 
mildew. 
The tree flowers just prior to `McIntosh` and `Priscilla` which is 
described in U.S. Plant Pat. No. 3,488. The apple fruit has good quality. 
Fruit hold texture and quality 2 months or more at 34.degree. F. 
After observation, the selection was asexually propagated by grafting on 
seedling apple roots. The grafted material has maintained the desired 
characteristics after propagation.