New Insecticidal Mode of Action for Tough Vegetable Pests | Queensland country life

Syngenta field biologist Jo Gentle with an untreated cauliflower (left) that shows extensive diamondback moth damage, while the cauliflower on the right has been protected with a single application of SIMODIS insecticide. Photo provided

This is branded content for Syngenta Australia.

Syngenta’s SIMODIS (Group 30) insecticide with PLINAZOLIN technology marks the next evolution in insecticide technology for plant health protection.

“PLINAZOLIN technology is a Syngenta innovation and a new mode of action that provides reliable, robust and prolonged efficacy against difficult-to-control pests in our major horticultural crops,” said Dr. Shaun Hood, Technical Services Manager for Syngenta.

“We expect the registration of the insecticide SIMODIS before the end of this year.”

SIMODIS insecticide will help growers control resistant and traditionally difficult to control pests, registrations including diamondback moth, two-spotted mite and western flower thrips (Table 1).

“We put SIMODIS to the test using commercial application equipment on a range of crops across Australia,” Dr Hood said.

“What impresses is both its level of control and its residual activity.”

Table 1 lists the crops and pests for which SIMODIS insecticide will be registered. Photo provided

Diamondback moth – redefining control

“AROUND Australia the diamondback moth has become increasingly difficult to manage, with resistance reducing the effectiveness of some well-known chemicals,” Dr Hood said.

In Gatton, Queensland in 2018, SIMODIS insecticide (plus AGRAL spray adjuvant) was compared to industry standards for control of diamondback moth (DBM) in a cauliflower crop .

Seven days after application (seven DAAs), all insecticides effectively controlled the DBM population (Figure 1).

At 14 DAA, SIMODIS insecticide recorded significantly better DBM control than Success Neo (Group 5), Coragen (Group 28), and PROCLAIM Opti (Group 6).

Residual activity of SIMODIS insecticide was evident at this time of application when vegetative growth had slowed.

Figure 1 shows the average number of diamondback moth larvae and nymphs per cauliflower plant after a single insecticide application when the harvestable cauliflower had a head diameter of 60 pc (BBCH 46), the numbers were assessed seven days after application (DAA). Gatton, Queensland (2018). Means followed by the same letter are not significantly different. Photo provided

At 20 DAA, the number of larvae and pupae almost tripled in the untreated control, suggesting that recent egg-laying had occurred.

SIMODIS was the only treatment that continued to control the DBM population at 20 DAA.

“This is a product that will redefine the control of DBM, it is a very effective insecticide but it will also allow brassica growers to regain control of resistant populations,” Dr Hood said.

“Monitoring is key to effective management of DBM. Apply SIMODIS insecticide as soon as local thresholds are reached, either at egg hatch or very soon after egg hatch to target young larvae.

“Growers should avoid applying SIMODIS to established populations dominated by large, later stage DBM larvae.”

Two-spot mites – resistance management resource

In Bowen, Queensland in 2019, SIMODIS insecticide (plus AGRAL spray adjuvant) was applied to a cucumber crop and compared to industry standards for control of two-spotted mites (TSM).

In the untreated control, TSM continued to increase throughout the trial, with more than 60 motiles per 20 mm leaf disc recorded 22 days after application (Figure 2).

SIMODIS insecticide effectively reduced the density of eggs, nymphs and adult mites to very low levels.

SIMODIS insecticide continued to show strong residual activity up to 22 DAA.

As a contact insecticide, residual activity of SIMODIS insecticide will be influenced by crop growth stage and spray coverage.

Figure 2 shows the average number of two-spot motile mites (TSM) per 20 mm cucumber leaf disc plant after a single application of insecticide, with treatments applied five weeks after transplanting. Numbers were assessed seven, 14 and 22 days after application (DAA). Bowen, Queensland (2019). Means followed by the same letter at the same assessment are not significantly different. Photo provided

“SIMODIS insecticide is an exceptional miticide. With mites, monitoring is key to effective management,” Dr. Hood said.

“For best results, apply SIMODIS insecticide as soon as local thresholds are reached, targeting the mite population before it becomes established.

“Up to two applications of SIMODIS insecticide per crop will be permitted, but to manage resistance growers will need to switch to a miticide from a different mode of action group before applying a second application of SIMODIS insecticide.

Syngenta Technical Services Manager, Dr. Shaun Hood. Photo provided

“These trials are a snapshot of what we have seen at many trial sites across Australia.

SIMODIS insecticide has consistently provided reliable, robust efficacy and exceptional crop safety against a range of pests and in a range of crops.”

SIMODIS insecticide has excellent sunlight stability and rainfastness properties, allowing long spray intervals.

Syngenta will demonstrate SIMODIS insecticide in the field at the Syngenta GrowMore event, Gatton, November 2022.

This is branded content for Syngenta Australia.