A Plant-Disease Survey in the Vicinity of San Antonio, Texas

Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: Within a few days after the collections were made a preliminary diagnosis was made in the laboratory and the notes were completed, accompanied by drawings and actual measurements when it was deemed advisable. In working over the material at a later date it was occasionally found necessary to change the...
More Description

Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: Within a few days after the collections were made a preliminary diagnosis was made in the laboratory and the notes were completed, accompanied by drawings and actual measurements when it was deemed advisable. In working over the material at a later date it was occasionally found necessary to change the previous determination. The time available permitted only a limited amount of culture work. It is not to be supposed that the list is by any means complete. The territory, comprising over 30,000 square miles, is too large to be covered in the time which has been devoted to the work. In view of the diversity of crops grown in the various sections and the fact that similar crops may reach the same stage of maturity over a very considerable range at the same time, and that it has not been possible to make the work continuous throughout an entire year, the incompleteness will be properly emphasized. Enough, however, has been done to be very suggestive and indicative of the profitableness of further work. DISEASES OF FRUIT TREES. APPLE. Black-rot (Sphaeropsis malorum Pk.).?This is the most common and serious disease of the apple (Mcdus sylvestris Miller) in this section. The foliage of the young plants in the nurseries was abundantly spotted and many twigs and limbs of the trees in orchards were seriously affected or entirely dead. Specimens collected: Austin, 460, 1270, 1911; Kerrvllle, 1598; Boerne, 1651, 1652; Nursery, 2552; Stockdale, 2626; Gonzales, 2659, 2660. Crown-gall (Bacterium tumefaciens Erw. Sm. and Townsend).? Trees about 8 years old were found seriously affected in one locality. A chlorotic condition preceded the death of the tree in each case. Specimens observed: Llano, 1772. leaf-spot (Cercospora mali Ell. and Ev.).?The spots caused by this fungus...