Lexicon Intrinsic fungicide

Lexicon Intrinsic Fungicide is a very effective turf fungicide. It gives up to 28 days control against a wide range of turf diseases, and also has advanced plant health benefits. These benefits are one of the reasons as turf agronomists we really like this product. It doesn’t just kill turf disease and has a whole host of benefits!

This fungicide has a dual mode of action, and contains both pyraclostrobin and fluxapyroxad in a 1:2 ratio. Pyraclostrobin is also the active in Insignia fungicide. The Lexicon Intrinsic fungicide label and MSDS are in the turf chemical section. It can be used in both the professional and homegarden markets for turf disease control.

The actives in Lexicon are in fungicide resistance groups 7 and 11, and so Lexicon Intrinsic is also a perfect rotation option in any resistance management program.

Plant health benefits of Lexicon Intrinsic fungicide.

With its excellent disease control Lexicon also gives proven turf health benefits that include:

• Increases in photosynthesis.
• Strong root growth.
• Improves the ability of turf to cope and recover from stress.
• Improves the rate of couch grass vegetative establishment and sod shelf life.
• Enables turf to deal better with shade.

Most fungicides on the market, give either a quick knockdown or a long term residual. Lexicon Intrinsic does both of these due to containing two highly effective actives.

These are 333g/L pyraclostrobin and 167 g/L effect fluxapyroxad. These are in fungicide Groups 7 and 11 respectively.

Pyraclostrobin is in fungicide Group 11 and is a quinone outside inhibitor-type fungicide. This stops the germination of fungal spores and prevents them from infecting plant tissue. It also has some curative activity as it stops fungal growth and causes it to die.

Fluxapyroxad is in fungicide Group 7 and is a SDHI (succinate dehydrogenase inhibitor). This stops plant respiration at Complex II, and so blocks the growth of fungal cells. Fluxapyroxad works against several diseases but is excellent against dollar spot.

Lexicon Intrinsic is very rainfast as it binds tightly to the waxy leaf surface. Once it enters the leaf it moves upwards systemically though the xylem to untreated areas.

This redistribution, along with its high level of activity, give long-lasting preventative and curative effects. This results in reliable, more consistent disease control. With the use of spray adjuvants we recommend not using organosiloxane type products with this as it may cause turf grass injury (as per the US label).

Diseases control with Lexicon Intrinsic.

Research in the USA and Australia shows that this fungicide provides excellent control of 27 key cool and warm season turf diseases which include:

• Anthracnose.
• Bentgrass dead spot.
• Couchgrass decline*.
• Brown patch.
• Brown ring patch (previously called ‘Waitea patch’).
• Dollar spot.
• Fairy ring.
• Fusarium patch.
• Gray leaf spot.
• Large patch Brown patch of warm season of turfgrasses, including Zoysia patch.
• Leaf spot Bipolaris, Drechslera, and Exserohilum spp.
• Melting out.
• Necrotic ring spot*.
• Pythium blight.
• Pythium root dysfunction.
• Red thread.
• Rhizoctonia leaf or Sheath spot.
• Rust.
• Spring Dead Spot.
• Summer patch.
• Take-all patch.
• Yellow tuft (Downy mildew).

Lexicon Intrinsic Trials for disease control.

Several trials show that Lexicon Intrinsic fungicide gives excellent control of a variety of diseases. These include brown patch, dollar spot, summer patch and fairy ring.

In a trial on SR7100 colonial bentgrass, Lexicon Intrinsic shows 0% Brown Patch after 21 days. This is in comparison to the untreated control that has an average 70.5% disease incidence.

In a trial on “Baron” Tall Fescue, Lexicon Intrinsic shows 1.8% Summer Patch after 21 days. This compares with 58.2% on the untreated control.

Lexicon Intrinsic fungicide Label and Lexicon Intrinsic MSDS.

Dollar spot

Lexicon Intrinsic gives both preventive and curative control of Dollar Spot. Whether disease has actively begun to infect, or conditions are right for growth, fluxapyroxad stops further growth when it contacts the fungi.

The numbers in brackets denote the number of rating dates out of 13 when dollar spot lesions were fewer than five. Disease breakthroughs with Interface and Headway occur after 28 days. Applications were made on June 4, July 2 and July 30. Source: Dr. Rick Latin, Purdue University, 2014.

Lexicon Intrinsic for Pythium

BASF trials show that Lexicon gives better control of pythium than azoxystrobin + propiconazole (Headway Maxx label).

Root dysfunction

• Applications with pyraclostrobin provide superior preventative control of pythium root dysfunction in comparison to with azoxystrobin (AzoForce fungicide) and cyazofamid (Segway Fungicide).
• Azoystrobin and cyazofamid provide moderate control of PRD in two of three seasons.
• Propamocarb does not work against pythium root dysfunction.

Pythium Root Rot

• Trials show that preventative control of Pythium root rot is best when you apply cyazofamid once soil temperatures reach 24 ℃. Cyazofamid also performs well as a curative application.

Brown Patch on Bent grass

Spring Dead Spot (SDS)

Plant Health benefits.

Turf quality.

The graph below shows Turf quality readings. The last rating is 28 days after the last application. Applications of Lexicon Intrinsic on a 21-day interval on the 5/13, 6/3 and 6/24. Source: Dr. Bruce Martin, Clemson University, 2014.

Lexicon Intrinsic for faster grow in times.

The image below shows Lexicon pre treated sprigs on the left, and untreated on the right at Pinehurst Number 7. The sprigs were treated 30 days and 5 days before sprigging. This is something you should seriously consider if you sprig, and have a limited grow in window to establish turf.

2020 work into harvest aids for improved couch sod shelf-life and transplant success. The results show that Lexicon Intrinsic increases the plant health of transplanted sod and improves the speed of establishment of hybrid couch plugs.

Better Root Growth with Lexicon Intrinsic.

One other plant health benefit of Lexicon Intrinsic is it improves root growth on both cool and warm turf species such as bent grass or buffalograss.

Improve Growth in Shade

Research on turf in shade shows that Lexicon Intrinsic improves turf quality.