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Golf Business News – NemaTrident techniques for targeting chafer grub larvae

Chafer season is late to start this spring but now the older beetles are starting to appear. Wet soil now creates ideal conditions for egg-laying, and warmer temperatures for larval hatching and feeding activity.

However, warm and moist soil conditions are also ideal for the beneficial action of the nematode to target larvae early in the life cycle, advises Syngenta Technical Manager, Sean Loakes.

“A soil temperature above 12⁰C for at least three hours a day is ideal for the NemaTrident B nematode species, Heterorhabditis bacteriophoraspecially selected to effectively target chafer larvae.

“NemaTrident B can provide effective control of chafer worms. New tests have shown how we can now better use beneficial nematodes in effective Integrated Turf Management strategies.”

Adult cockchafer – May Bug

He points out that chafer control with nematodes is a numbers game, the more nematodes are used in the right conditions, the greater the chance of enough larvae to enter active larvae.

“Chafer grubs have an amazing ability to avoid nematode attacks, using their false legs to wipe nematodes off their bodies. However, if enough nematodes are present they will eliminate the larvae, with good results even for large instar grubs.

“It is important to choose the most suitable nematode for the target pest, and use the largest number in the best case. “Using a product with a mixed number of different nematode species can result in too few levels needed in the soil environment or not be effective at low soil temperatures,” he warns.

Juvenile chafer grub infestation

NemaTrident B nematodes are particularly effective at foraging for chafer grubs in the soil. Once inside the larvae, they release bacteria that kill them. Nematodes move through the soil in a moist film, so they are best used if the soil is moist and kept watered or wet for 14 days after application. Non-irrigated areas pose a major challenge to nematode application, where they should be applied during the rainy season.

“NemaTrident should be used in conjunction with NemaSpreader, a bespoke combination of surfactants specifically designed to maintain optimal nematode movement conditions in the soil.” Trials have shown up to 30% control of soil pests when NemaTrident is used in conjunction with NemaSpreader.

Sean advocates NemaTrident B application should be timed after the peak of adult spawning and egg laying, to ensure that the nematodes are in the soil as the larvae emerge after three to four weeks; small larvae are the most effectively controlled.

Determining which type of chafer beetle is an important species to target will influence the appropriate timing, as well as the number of larvae to control, he highlights.

The most common garden chafer, for example, is very active egg-laying in mid-June and has a one-year life cycle that is not very well controlled; while the summer chafer is most active in July and August, and having a two-year life cycle that is more difficult to control where large grubs are present.

“That makes the timing and method of application very important to get good results. Nematodes are organisms, and therefore must be handled carefully from delivery, with storage and use that will ensure that the maximum amount is used in the best possible condition. “

Sean’s top tips for success with nematodes include:

  • Store refrigerated at 4-7⁰C as soon as possible on delivery
  • Pre-mix in warm water before adding to the spray tank
  • Remove the filters from the sprayer and make sure they are clean
  • Apply at a water volume of 500 – 1000 litres/hectare
  • Use Syngenta XC 08 Soil Nozzle
  • Always use NemaSpreader with NemaTrident applications
  • NemaTrident B should be applied at a rate of five billion nematodes per hectare

Syngenta trials have shown the most reliable and consistent control of chafer grub in an integrated approach using NemaTrident B plus NemaSpreader, following Acelepryn insecticide treatment.

A large chafer bug

A recent study at Forest Pines Golf Course in Lincolnshire – using a well-timed application of Acelepryn at peak egg laying, followed by NemaTrident B – confirmed that large chafer larvae stressed or weakened by Acelepryn may be more susceptible to nematode infestation, bringing a lot. effective and reliable total control.

“When chafer grubs are the main target this two-pronged approach can give good results,” reports Sean.

“However, turf managers and agronomists should be aware that it is only allowed to use one Acelepryn per season and there is a limited treatment area, so if leather jackets are a big issue the insecticide is best used there, and NemaTrident B it is an important property of chafer grub. control.”


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