Strawberry and Raspberry Pest Management in Wisconsin

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34 bend over to form a “shepherd’s crook”. Blighted flowers and immature fruits are brown to black and shriveled. Pruning out infections may help reduce the spread of fire blight. Make cuts at least 12 inches below the lowest visible symptoms. Sterilize tools by immersing them for 30 seconds in a solution of 1 part household bleach plus 9 parts water. Fire blight has been observed throughout the state and on most of the popular cultivars including Boyne, Heritage, and Latham. Viral diseases Several different diseases caused by viruses have been reported in Wisconsin. There are no chemical controls to treat these diseases, so sanitation and managing the nematodes and insects that carry the diseases are essential. The nematode Xiphinema 34mericana spreads tomato ringspot virus, the cause of crumbly berry. If soil samples test positive for this nematode, soil should be fumigated (see above) the fall before spring planting. Viral diseases can be avoided by purchasing virus-free stock from a reputable nursery and planting raspberries at least 500 feet away from existing wild or old cultivated raspberries. Phytophthora root rot Several species of Phytophthora, a soilborne, fungus-like organism, cause root rot of raspberry. Above-ground symptoms include weak, stunted canes; small, off-color leaves; or complete decline and death of canes. Roots, crowns, and the lower portion of canes are rotted and typically reddish-brown. Planting in well-drained soil is the most important cultural practice for preventing Phytophthora diseases. Planting on raised beds or installing drainage tile will improve water movement from roots. The cultivars Titan and Hilton are highly susceptible; Festival, Heritage, Reveille, and Taylor are moderately to highly susceptible; and Latham is relatively resistant. Rust diseases Late leaf rust occurs on red and purple raspberries but not on black raspberries or blackberries. The fungus that causes late leaf rust spends part of its life cycle on white spruce. In early summer, spores are released from spruce trees and carried by wind to raspberry leaves. Spores produced on raspberry leaves can re-infect raspberry late into the season. Orange rust is potentially more devastating than late leaf rust. However, it does not affect red raspberry. The orange rust fungus becomes systemic in the plant and greatly reduces vigor and crop yield.
Raspberry Insect Management Several insect and mite pests can attack Wisconsin raspberry plantings. Most of these pests do not occur every year or in every location, but they do show up on occasion. The occurrence of native and escaped wild brambles in the state offers ideal food and habitat for all pests that attack raspberries, and when large populations build up on these wild plants, they readily invade cultivated plantings. Eliminating wild brambles and unproductive plantings within 1,000 ft of the cultivated canes will greatly reduce insect attack. In isolated areas it may be possible to grow raspberries for several years without noticeable insect damage, and some growers do not regularly use insecticides. However, in most locations it will be necessary to control some insect pests almost every year for maximum productivity. Some occasional minor raspberry pests, such as cane maggot and tree crickets, are not specifically covered in the spray table. A routine spray program usually eliminates these minor pest problems, but occasional specific controls may be necessary. Growers should inspect their plantings frequently for early detection of potential pest problems. INSECTICIDE UPDATE United Phosphorous, Inc. (UPI) registered the active ingredient acetamiprid on raspberry under the trade name Assail. This product is in the neonicotinoid insecticide class. Two formulations are registered: 30 SG which is a 30% active ingredient soluble granule and 70 WP which is a 70% active ingredient wettable powder. On raspberry these products are registered for the control of tarnished plant bug, aphids, thrips, leafhoppers, and Japanese beetle. Both have a 12 hour restricted entry interval (REI) and a 1 day preharvest interval (PHI). The 1 day PHI means that you must suspend picking for at least 24 hours if an application is necessary during harvest. See table 9 for application rates. Dow AgroSciences has registered a chemically modified and more insecticidally active product in its line of spinosyn insecticides. Spinetoram carries the trade name Delegate on raspberry. It is a 25% WG (water-dispersible granules) formulation. It is registered for controlling leafrollers, loopers, raspberry fruitworm, and raspberry sawfly. It has a 4 hour restricted entry interval (REI) and a 1 day preharvest interval (PHI). The short PHI may be useful when pests move into the crop during harvest since picking would be halted for only one day. For best results, use this product when larvae are very young, so monitor pest activity regularly to detect newly developing infestations. Refer to table 9 for application rates. Delegate will likely replace spinosad (SpinTor) in conventional production systems, but the organic certified formulation of spinosad, called Entrust, will remain available. FMC suspended its registration of Capture (bifenthrin) on raspberry, but the same active ingredient is still available under the trade name Brigade. The two formulations available for use are WSB (a 10% active ingredient water soluble bag formulation) and 2 EC (2 lb/gal emulsifiable concentrate). The water soluble bags are designed to be added to the spray tank intact, and it is against labeling to open them. Each bag contains 0.5 lb of formulated Brigade, enough to treat one acre at the low label rate and one half acre at the maximum label rate. If you have less than one half acre of raspberries the 2 EC formulation may be a better option than the WSB formulation. Brigade is a restricted use insecticide. 35
Page 1 and 2: A1934 Strawberry & Raspberry Pest M
Page 3 and 4: INTEGRATED PEST MANAGEMENT FEDERAL
Page 5 and 6: PESTICIDES AND COMMUNITY RIGHT-TO-K
Page 7 and 8: Table 2. Examples of pesticides wit
Page 9 and 10: Table 3. Toxicity categories of pes
Page 11 and 12: Reportable spills involving SARA su
Page 13 and 14: Planter granular applicators can be
Page 15 and 16: Please note that this recycling pro
Page 17 and 18: Strawberry Disease Management Read
Page 19 and 20: Table 5. Disease resistance ratings
Page 21 and 22: Strawberry Insect Management INSECT
Page 23 and 24: Table 6. Spray schedule for strawbe
Page 25 and 26: Table 6. Spray schedule for strawbe
Page 27 and 28: Strawberry Weed Management A succes
Page 29 and 30: label for specific instructions on
Page 31 and 32: Table 8. Weed management for strawb
Page 33 and 34: Table 8. Weed management for strawb
Page 35: products are taken up through leave
Page 39 and 40: Table 9. Spray schedule for raspber
Page 41 and 42: Raspberry Weed Management Effective
Page 43 and 44: Table 10. Weed management for raspb
Page 45: SPRAY RECORD SHEET Date applied Mat

Strawberry and Raspberry Pest Management in Wisconsin

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