directed nozzles while spraying and maintain a slow ground speed (<2.5 mph). The brown rot fungus ( Monilinia laxa ) attacks the tree by invading the stamens and pistils of the flower when open. From there, the fungus can move into and kill the spur or shoot. Young fruits are also susceptible in early spring and infection of fruit may extend to spurs and shoots. If bloom is extended and the weather is wet and rainy, no more than ten days should elapse between treatments.
then a treatment the following spring should be applied at leaf emergence (sometimes this can be concurrent with bloom). If fruiting structures are not present, you can hold off the petal fall spray and monitor leaves in the spring for lesions. As soon as fruiting structures are evident, however, apply a fungicide as long as conditions are conducive to disease development (wet). If fruiting structures are not present, delay treatment until they are.
The shot hole fungus ( Wilsonomyces carpophilus ) is notoriously more prevalent in wet years. This fungus requires water for all its activities, so periods of extended rainfall create a situation that favors shot hole disease epidemics. The fungus can cause lesions on leaves and fruit, but most of the time it infects the leaves as they emerge from the leaf bud. Leaf infections may lead to defoliation, which usually occurs in early spring. Shot hole infections of young fruit, shortly after they emerge from the jacket, can cause the fruit to drop. As fruits enlarge, shot hole infection results in a lesion, but the fruit no longer falls. About the first of May, when the embryo of the nut begins to grow, the hull becomes resistant to infection and no further lesions develop. Shot hole is usually controlled by fungicide applications after bloom (when leaves emerge after bloom), usually from petal fall to two weeks after petal fall. An IPM strategy for shot hole control is to monitor orchards in the fall and spring for shot hole lesions and fruiting structures. Fruiting structures appear in the center of leaf lesions as small black spots (sporodochia) and can be seen with a hand lens (www.ipm. ucdavis.edu). If fruiting structures are present in leaf lesions in fall,
Weiss McNair is proud to announce the 2850 Sweeper
NUT HARVESTING EQUIPMENT
2850 SWEEPER
The 2850 is a “new” Low Profile Self-Propelled Sweeper. Powered by a John Deere 4045-T, Tier 4F, 74 HP engine, with NO DEF FLUID required. The ground drive features two-speed piston motors with double-reduction gear boxes powered by a high efficiency hydraulic system. With a cab height of only 54 inches, the 2850 is a powerful unit that is 12 inches lower than the standard height air cab sweeper, includes an ergonomic seat, and fully illuminated dash panel switches. The 2850 is the perfect height for high density orchards with very low canopies. The 2850 standard equipment includes rear view camera, large windows for improved visibility, and full heating & air conditioning in a dust-free, pressurized cab. Finally, the cabin has a full gauge display with tachometer, engine temperature, and oil pressure, along with an easy-to-read electronic fuel level display.
For more information or to find a dealer near you, call us at (530) 891-6214 or visit our website at weissmcnair.com
| 100 Loren Avenue, Chico, CA 95928 (530) 891-6214 Fax (530) 891-5905 www.weissmcnair.com |
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