CBR Management

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Several important issues face peanut growers in the next few years, especially growers in the V-C region. Changes in regulations relative to use of metam sodium for CBR have many growers uneasy about the future. And while Temik is scheduled for phased removal from the market, litigation issues have forced growers to consider options more quickly than anticipated. These two options have been a standard for many growers for many years. Alternatives to metam sodium are longer rotations, Proline in the seed furrow and Provost in the leaf spot/stem rot program, and resistant varieties. Fungicides are not as effective as fumigation, but they may eventually become the standard depending upon the
“adjustment” to fumigation regulations by peanut growers. The value of Temik in terms of thrips control and suppression of nematodes has been well documented. Options for nematodes are challenging as one looks at issues associated with fumigation. Rotation, however, can certainly help. From a thrips standpoint, Thimet/Phorate or Orthene in the seed furrow have proven to be good alternatives to Temik. However, the consistency of performance is often lower than Temik. Consequently, growers need to be prepared for early season applications of Orthene based on thresholds. Although two applications (in-furrow and postemergence) seem like a difficult pill to swallow, cost of this approach is still no more expensive than one application of Temik. We also worry a little about injury to peanut from Thimet/Phorate on sandy soils with low organic mattercontent. While the damage is transient, it will give growers a different look compared with Temik. Compatibility of Orthene, inoculant, and Proline has come up in conversations on several occasions. Most of the data that I am aware of indicate that these products will work independently with no major problems (although I do wish I had a few more data sets.) All in all, growers are going to have to adapt to new approaches to managing CBR and thrips. We have the tools but they are simply less consistent under heavy pressure of CBR and thrips. Consequently, management will have to increase to minimize the negative effects of these pests.

Article first appeared as North Carolina Peanut Note (PNNC-2011-005)