| Problem Code: |
PPWS
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| Requesting State(s): |
Demard,Emilie Pauline (UT)
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| Potential Products: |
Admire Pro; Danitol 2.4 EC Spray; Novodor Flowable Concentrate; Sivanto Prime; Trident; Assail 70WP; Beleaf 50 SG; Plinazolin; Exirel; Plexenos Speed; Platinum; NemAttack
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| PCR Reason for Need: |
The California prionus, Prionus californicus, is a common pest of stone fruits in Utah mainly encountered in tart cherry and peach orchards. Adults do not feed but a female can lay up to 200 eggs during its lifespan while larvae feed on the root system. Heavy infestations can cause yellowing, twig dieback, and the death of the tree. Management of P. californicus in Utah orchards consists of a combination of cultural methods and mating disruption using the sex pheromone, (3R,5S)-3,5-dimethyldodecanoic acid. No insecticides are registered for this pest in Utah and cultural practices are not highly effective. While mating disruption has shown efficacy (Barbour et al. 2019), no research was done about optimizing pheromone density and load to reduce the cost of this method. Moreover, while a previous study shows reduced efficacy of imidacloprid (Admire Pro) on older larvae (Alston et al. 2010), no other insecticides have been tested to help manage this below ground pest. [UT: 6/25 DS]
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| PCR Details: |
As far of today, only mass trapping with sex-pheromones have been used by Utah growers. Further strategies need to be investigated to expand tools available for conventional and low input growers. Moreover, Prionus beetle is a common pest of the Pacific Northwest, and no insecticides are registered in other systems where it is a problematic pest such as hope, hazelnut and grapes. Thus knowledge gained on management strategies could be transferred to other cropping systems. We proposed to evaluate the following tools: 1) Exirel (cyantraniliprole), make 3 drench applications at 13 oz Exirel /A, with 5 day RTI and 1 day PHI; 2) Sivanto (Flupyradifurone), make 2-3 drench applications at 21-28 fl oz Sivanto Prime /A, with 10 day RTI and 1 day PHI; 3) Danitol (Fenpropathrin), make 1 drench application at 16 oz Danitol /A, with unknown PHI; 4) Platinum (thiamethoxam), make 1 drench application at 2.17-2.6 oz Platinum /A, with unknown PHI; 5) Trident (Bt tenebrionis strain SA-10), no use instruction provided, currently labeled for CPB as: Make applications at 6 quarts Trident/ A, with 4-14 day RTI, and no limit on number of applications or PHI; 6) NemAttack (entomopathogenic nematodes Steinernema and Heterorhabditis) apply via sprinkler irrigation system at 50 M. nematodes / A, per label: keep soil moist for 2 weeks after applying. Different soil managements are also present in tree fruit orchards in Utah. Some growers use bare soil, others use cardboard as mulch, others use cover crops such as legume allewey (birdsfoot trefoil), low-growing alyssum, and straw mulch. Evaluating the impact of these different soil management on Prionus beetle will help us understand which practices help in reducing their populations
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| Study Goals: |
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| Comments |
HQ suggests to also consider the following products: 1) Plexenos Speed (Spidoxamat+Flupyradifurone), 2) Beleaf (Flonicamid), 3) Plinazolin (Isocycloseram), 4) Assail (Acetamiprid), 5) Admire Pro (Imidacloprid), 6) Novodor (Bt tenebrionis strain NB176). Finding sites or cooperators with high infestation may be challenging. See IS00480 (Priunus / blueberries) study for reference. [NC: 7/25 DS]
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| Study Accomplishments: |
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