12.Are these pictures worrisome?
Don’t let them be—just be informed
The good news is that the sunflower moth is manageable—We know:
How to scout (if we don’t just automatically spray, our apologies to IPM practices)
When to spray
What to use
To follow up to ensure the first spray is OK
This just happens to be a major downfall of too many inexperienced, first time, or “a-couple-of-days-too-late” growers
13.Easy Way to Ruin Sunflower
In our experience this is the #1 problem in Texas sunflower production
Stated a different way, the most likely stumbling block that turns a decent crop into something sub-optimal, and in worst cases, a failure
14.The “Boll Weevil of Sunflowers”—Sunflower Moth
Too many growers “never knew” about
this insect before growing, or if they did they sprayed too late—It will lead to major crop damage if not controlled.
The moth you scout for—
early dawn or nearly dark!
The larvae feeding which
leads to fungal infection.
15.Sunflower Moth
Threat for 7-10 days beginning with initial bloom when pollen becomes available
Second spray when needed 5-7 days later (but not for low yields in dryland)
Don’t get caught!—Hybrids bloom fast, from 5% to 75% bloom in 2-3 days if warm
Don’t wait until 2-5% bloom to contact your airplane; get on the spray schedule
Uncontrolled larvae eventually burrow into head destroying seed--increasing susceptibility to Rhizopus head rot
16.Rapid Progression of Bloom
17.Example of Larval Abundance(no spraying)
18.Sunflower Moth Spraying
“Managing Insect Pests of Texas Sunflower,” Texas AgriLife Extension Service, E-579 (2009)
http://agrilifebookstore.org for view/print/download color copy
Sunflower moth treatment strategies
Historical ‘By the Book’ suggestions
Current ‘By the Book’ suggestions
Industry recommendations & practices
19.Sunflower Moth Spraying
Historically “By the Book” – 1998 Texas Guide
Spray @ 20% - 25% bloom when any moths are found in the field – Count any head as blooming when any part of the flower is exposed.
Apply first pyrethroid (possibly with methyl parathion for added quick knock down) @ 20-25% of plants in bloom
Downside: Have to be scouting early, No room for error; practice tolerated significant level of moths in the field; moths have 1-2 days to freely lay eggs
Result: Applications not timed right then producers are likely to have damage?
20.Sunflower Moth Spraying
Current “By the Book” (Extension’s insect guide)
Spray at 15-25% bloom ‘when moths are in the field’, Count any head as blooming when any of the ray flowers are opening and disk flowers are exposed.
No statement on how many moths (threshold is presence, not number)
Apply first pyrethroid (possibly with added methyl parathion for quick knock down)
Downside: Still no room for error; moths still have 1-2 days to freely lay eggs on many heads
Result: Still have potentially damage if late
21.Sunflower Moth Spraying
Industry practices & recommendations #1
Spraying earlier (~5% bloom, i.e. 1-2 days earlier) & lower moth threshold—this minimizes mistakes, may provide better results, allows room for delayed spraying
Makes the spraying decision sooner (which allows more time to schedule spraying)
Downside: Could you spray too early? If you spray this early, would you lack chemical residue in 5-7 days, or be forced to spray a second time (esp. dryland)?
Result: No method is immune to failure, but industry widely believes this approach offers protection against common pitfalls (spraying too late, more time to act if it appears first spray was not effective), possible better control
22.Sunflower Moth Spraying
Industry practices & recommendations #2
Spraying earlier and automatically (~5% bloom, i.e. 1-2 days earlier)
Makes the spraying decision sooner (which allows more time to schedule spraying)
Downside: Again, could you spray too early, and lack chemical residue later? Did you in fact need to spray, especially for late-planted sunflower (thereby an unnecessary expense)? It is wise to still know what level of moth was in the field (might influence decision on whether to spray a second time)
Result: No method is immune to failure, but at least you can’t say you didn’t spray.
23.Hybrid trial with bloom ranging from 0% (upper right) to 20-25% (center back). Using (latest R-4/initial R-5.0) bloom, the field is >5% in bloom as a whole.
24.Calvin Trostle/Pat Porter, Texas A&M AgriLife Extension Service
This head is considered blooming
25.Sunflower Moth Spraying & IPM
Is it unthinkable to suggest we’d spray sunflower for sunflower moth without scouting
However, industry experience suggests that as a group we might be better off if we sprayed automatically because of the mistakes that can occur
It is commonly thought “If you have head damage it means you sprayed too late”
This discounts that truly sometimes a spray doesn’t work
Or the moth flight was late
26.New Insecticide, New Approach—Prevathon, 2013 I.
Active ingredient, chlorantraniliprole (Rynaxypyr), from Dupont
“Softer” chemical; does not affect honeybees and other beneficials
See supplemental label for further information
Ignore label’s minimum 2 gallons water per acre, go with at least 3 gpa, preferably 4
27.New Insecticide, New Approach—Prevathon, 2013 II.
“Translaminar” movement of insecticide to feeding larvae
Little to no activity on adults so scouting after your first spray doesn’t mean much
10 to 14-day spray interval (though supplemental label says 7 days, use MSO additive)
Extension & Dupont agreement, December 2013: initial spray of 14 oz/A at 1% bloom and then 14 oz./A again in 7-10 days (a single initial 20 oz./A application may not be enough)
28.New Insecticide, New Approach—Prevathon, 2013 III.
See the special label for Texas at http://www.cdms.net
First spray earlier (initial bloom) than pyrethroid alone (5-20% bloom)
Initial data compared to pyrethroid, which kills beneficials, demonstrates lower larval counts in the head for Prevathon
First impression from Texas A&M AgriLife Extension entomologists: results are good, mixed thoughts on excluding pyrethroid until more data is collected
Besiege, from Syngenta, is a mix of Rynaypyr (different formulation) and pyrethroid
29.New Insecticide, New Approach—Besiege, 2013
Syngenta—mix of chlorantraniliprole and pyrethroid (Lambda-cyhalothrin), 6-10 oz/A
See the special label for sunflower at http://www.cdms.net
First spray “before pests reach damaging levels”
Chlorotraniliprole in Prevathon: 10 oz./A rate of Prevathon = 7.6 oz/A for Besiege
A 14 oz./A rate of chlorotrniliprole would be 10.6 oz./A of Besiege, which is a little high
This rate of Besiege @ 7.6 oz./A includes 1.54 oz/A of Warrior II/L-cyhalothrin (labeled range for sunflower, 1.28-1.92 oz./A)
30.New Insecticide, New Approach—Belt (Bayer), 2013
First spray same time as pyrethroid
Like Prevathon, this does not kill adults either, but kills young feeding larvae; does not have movement within the plant
Ignore label’s minimum 2 gallons water per acre, go with at least 3 gpa, preferably 4
First impression from Texas A&M AgriLife Extension entomologists: results are good, mixed thoughts on excluding pyrethroid until more data is collected
Limited data suggests good control, reduction in feeding larvae
31.Bottom Line—Sunflower Moth
Whatever approach you choose:
1) Do your best to achieve uniform emergence, hence uniform bloom
2) Two weeks prior to probable spray, get a commitment from applicator and make sure chemicals are on hand
3) Do scout at first bloom anywhere in the field (if you are a first-time grower, get help)
4) Aerial spray—minimum 3 gal/A, hopefully a little more
5) Follow-up scouting a from 3 - 4 days after first spray to ensure you get kill to know if moths are still present
32.Frank Discussion on Sunflower Moth Spray Timing
Our AgriLife recommendations (for pyrethroids?) in and of themselves are OK, but you must scout early and be prepared to spray, if you are ready then YOU CAN GET IT DONE AT THE RIGHT TIME (THE NEXT DAY?) and get good control.
Too many farmers don’t take time to scout/spray in time
Although this violates what we know and believe about Integrated Pest Management (IPM), collectively as a group, farmers may be better off is spraying automatic-ally even if only a few scattered moths are observed.
Scouting in the heat of the day is not reliable for moth populations between few and moderate. They hide on the leaves rather than up on the heads as during pre-dawn and late dusk.
A limitation of AgriLife recommendations is people have not understood that a bloom head is at the latest R-4 stage and not the R-5.1 stage. When we use the late R-4 stage then the 15 to 25% bloom can in fact be closer to the 5 to 10% bloom using the R5.1 stage.
33.Sunflower Moth Larval Damage
This is especially detrimental
to confectionary.
34.Upper left, R-3, will soon reveal back side of ray petals (above, R-4), then with ray petals open the next day (left, R-5.1) will begin physiological bloom around the edge of the face.
This picture sequence is about 7-9 days.
35.“Managing Insect Pests in Texas Sunflower,” Dr. Ed Bynum, Texas AgriLife Extension—Amarillo (2009)
36.Other Insects in TX Sunflower
Soybean stem borer in sunflower (Dectes texanus Leconte); adult is Longhorn beetle; also known as sunflower stem borer or sunflower stalk girdler
Stem weevil
37.Stem Borer (D. texanus)
Occasional high incidence (e.g., 2001); often not noticed until plants lodge
Egg laying near petioles, single larvae burrows in pith, often found late in season in base of plant
Girdles plant at soil line from inside out; backfills bore hole with plant fibers, frass
38.Adult Long-horn beetle
(Dectes texanus)
39.
40.This is the soybean stem borer larvae, about ¾”, maybe 1” long that girdles the sunflower stalk from the inside out, leaving a neat cut or break. Rarely ever more than one per plant.
41.Stem Borer (D. texanus)
No pheromone traps, hard to scout, no control recommendations at this time
Incidence appears higher near/after soybeans enough that we don’t recommend soy after sunflower or vice versa
Observations suggest lodging potential increases with higher plant populations
Be ready to harvest
42.Stem Weevil
Diverse observations on this being a problem
National Sunflower Association annual surveys haven’t shown much activity
Seed company production finds this to be a common problem
Furadan no longer available for control
Seed treatments are not effective
SW larval rates drop significantly after mid June planting dates – (Carl Patrick, retired AgriLife Extension entomologist)
43.Other Misc. Items
Red/gray seed weevil?
Banded sunflower moth?
Many companies now treat all hybrids with CruiserMaxx; Bayer also uses a package of treatments (can’t remember their insecticide)
44.Seed Treatments
Gaucho, Poncho, CruiserMaxx (which also includes fungicide)
The latter two can add significant cost to seed
Generally 45 days of protection is about the limit of expected protection
?Some protection from wireworms but not carrot beetle