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Mitigation Measures for Bt Resistant Corn Rootworm

Extensive injury by corn rootworm (CRW) to pyramid Bt rootworm (Bt-RW) hybrids was observed in several Ontario counties in 2020, suggesting that CRW populations have developed resistance to multiple Bt-RW proteins.
 
The Canadian Corn Pest Coalition (CCPC) and OMAFRA have developed mitigation recommendations for continuous corn producers, in hopes of knocking back the resistant corn rootworm population present in Ontario. Producers with high risk fields of continuous corn production (3+ years) with a history of repeated Bt-RW hybrid use need to take measures over the next few years in hope of restoring the durability of current Bt-RW hybrids:  Mitigation Measures to Manage Bt Resistant Corn Rootworm in Ontario
 
Bt resistance will now always remain within the CRW populations in Ontario. At best, through implementing mitigation measures above, we can knock CRW populations back to where resistant individuals are not as prevalent within these populations. Once these populations are reduced, a long term responsible approach will be needed for rootworm management. This includes only planting corn for 3 years in a row in any given field, with only one year requiring the use of Bt-RW hybrids. This results in less selection pressure towards Bt resistance in the rootworm population. This strategy will only work if fields are rotated out of corn in Year 4:  Long-Term Responsible Use of Bt Hybrids for Rootworm Management. This long term approach to responsible use should be considered by all continuous corn producers including those who are not currently experiencing unexpected rootworm injury on Bt-RW hybrids.
 
Source : Field Crop News

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Spider Mite Control with Predatory Mites (Neoseiulus californicus)

Video: Spider Mite Control with Predatory Mites (Neoseiulus californicus)

The predatory mite Neoseiulus californicus is an effective natural enemy of various species of spider mites, including the two-spotted spider mite (Tetranychus urticae). As a key player in biological pest control, this predator helps growers protect their crops sustainably.

How does Neoseiulus californicus work?

•Specializes in targeting the larval and nymphal stages of spider mites.

•Also consumes spider mite eggs, ensuring population control.

•Detects prey through webbing and leaf damage rather than sight.

•Feeds by sucking out the contents of its prey.

Why use Neoseiulus californicus for spider mite control?

•Highly adaptable to different environments, including warm and dry conditions.

•Works as both a preventive and curative solution for spider mite infestations.

•Complements other predatory mites, such as Phytoseiulus persimilis, for integrated pest management (IPM).

•A natural, sustainable alternative to chemical pesticides.