Walnut Husk Fly: Biology, Monitoring and Management. R. A. Van Steenwyk Dept. of E.S.P.M University of California, Berkeley
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1 Walnut Husk Fly: Biology, Monitoring and Management R. A. Van Steenwyk Dept. of E.S.P.M University of California, Berkeley
2 Walnut Husk Fly: Biology Rhagoletis completa a tephritid fruit fly native to Mexico, Texas and surrounding states. One generation per year Emergence from late May through early September Peak emergence usually July/August
3 Walnut Husk Fly: Life Cycle
4 Walnut Husk Fly: Damage Maggots feed inside husk, turning it soft and black Fleshy parts decay and stain the nutshell Early season: shriveled and darkened kernels, mold, lower yields Late season: stain shells, make husk removal difficult Stained nuts unable to be sold in-shell
5 Walnut Husk Fly: ID Male Female
6 Monitoring: Traps and Baits Yellow sticky panel or apple maggot (AM) trap. Buy no-bait traps (no bait in the stickem) Attach bait: ammonium carbonate Place traps prior to expected emergence of first flies mid May to early June.
7 Monitoring: Traps and Baits Many trap manufacturers: Trece, Suterra, Alpha Scents, etc. Vary somewhat in trap size, type of stickem and bait dispenser Alpha Scents has performed the best Replace traps and bait regularly Place traps on N side of tree hanging freely within canopy cover, not in the sun
8 Chemical Control of Walnut Husk Fly
9 Control Timing Timing is critical for WHF control 1 st spray: when the first flies are caught for GF-120 or the first significant rise in trap counts for other materials Fly counts should drop to zero or near zero after you spray Additional sprays: applied at two to three week intervals or when fly catches increase rapidly Sprays usually are not needed after husk checking or less than one month before harvest
10 Control: Spray Techniques Two spray techniques have been utilized Full coverage sprays Usually as part of a pest management spray program Some codling moth/walnut aphid/spider mite insecticides/miticides may not effective for WHF control Bait sprays specific for WHF Often more effective than full coverage sprays without bait No effective biological or cultural controls
11 Control: Spray Volume Traditionally: sprays applied with air blast sprayers at 100 gal/ac Most sprays: concentrate or semiconcentrate sprays Latest trend: concentrated bait sprays (10 to 25 gal/ac) Reduced cost and time required
12 Control: Spray Volume New ultra low volume spray technique. Concentrated sprays bait spray a 1 to 5 gal/ac at 5 to 8 mph. Same concept as the GF-120 spray rig but much larger pump and tank mounted on trailer pulled by ATV. More frequent applications, i.e. 10 days apart to twice a week.
13 Insecticide Efficacy: Orchard of Hartley walnuts near Hollister, CA with a high WHF population Treatments applied with hand-gun orchard sprayer Methods Operated at 250 psi, final spray volume of 300 gal/ac
14 Insecticide Efficacy: 3 to 4 applications each year Methods Mid-July, mid-august, late- August/early September (every 3 weeks) Treatments replicated 4 times in RCB design Replicates consisted of a single tree Evaluation of 125 nuts/replicate before commercial harvest (mid- Sep)
15 Excellent Efficacy Good Efficacy Moderate Efficacy Little Efficacy % Control 75-95% Control 50-75% Control 20-50% Control Temitry Success (Entrust) Leverage oz/acre 6.4 oz/acre Malathion 2.8 fl.oz/acre (malathion and gamma-cyhalothrin) (spinosad) 64.0 fl.oz/acre (beta-cyfluthrin Assail and imidacloprid) Assail 4.0 oz/acre 6.0 oz/acre (acetamiprid) (acetamiprid) Athena Assail Belay 20.0 fl.oz/acre Harvanta 8.0 oz/acre 6.0 fl.oz/acre (bifenthrin) 16.4 fl. oz/acre (acetamiprid) (clothianidin) Warrior (Cyclaniliprole) Danitol 2.56 fl.oz/acre (lambda-cyhalothrin) Danitol + Belay 21.3 fl.oz/acre Belay No Efficacy 21.3 fl.oz + 6 fl.oz/acre (fenpropathrin) 3.0 fl.oz/acre 0-20% Control (fenpropathrin (clothianidin) + clothianidin) Athena + Brigadier Delegate 20.0 fl.oz fl.oz/acre 3.2 oz/acre Bexar (bifenthrin and avermectin + zeta-cypermethrin (spinetoram) 27.0 fl.oz/acre Stallion + Brigadier and chlorpyrifos) Intrepid Edge (tolfenpyrad) 11.8 fl.oz fl.oz/acre Brigade + Brigadier fl.oz/acre (bifenthrin and imidacloprid + zeta-cypermethrin and chlorpyrifos) 16.0 oz fl.oz/acre (spinetoram and methoxyfenozide) (bifenthrin + zeta-cypermethrin and chlorpyrifos) Venerate XC fl.oz/acre Altacor Baythroid Provado (Burkholderia fermentation product) 4.0 oz/acre 2.8 fl.oz/acre 7.0 fl.oz/acre Exirel (chloraniliprole) (beta-cyfluthrin) (imidacloprid) 20.5 fl.oz/acre
16 Feeding Stimulant Efficacy 1-2 wk. old WHF (15 male, 15 female) placed in rearing cage Filter paper dipped in diluted bait, hung from center of cage Filmed on both sides for 30 minutes in environmental cabinet Recorded number and duration of WHF landings on card
17 Mean WHF Total Time (s) Mean WHF Time/Land (s) Molasses Concentration Trials *** *** * p 0.1 ** p Time Time/Land Molasses 1:50 Molasses 1:100 Water 0
18 Mean WHF Total Time (s) Mean WHF Time/Land (s) Molasses Concentration Trials ** ** ** p 0.1 *** p Time Time/Land ** ** Molasses 1:4 Molasses 1:50 Molasses 1:100 Water 100 0
19 Mean WHF Activity Mean b WHF activity Bait Amount a Total time (s) Time (s)/land Water b 37.9 b Molasses (Feed) 5ml a a Brandt Insect Bait 5ml b 33.6 b NuLure 5ml b 57.5 b GF-120 5ml a a F P <.0001 a Brought up to 100ml. b Means followed by the same letter in a column are not significantly different (Fisher s Protected LSD, P < 0.1).
20 Acknowledgement I gratefully acknowledge the California Walnut Board for support of this research, numerous cooperating walnut growers and my students and technicians without which this research would not be possible.
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