June Peanut Grower Magazine Column a Little Early
In June most growers in the V-C region are applying gypsum on Virginia types. Jumbo runners also need gypsum. In many cases gypsum is applied earlier than needed and this creates some risk if we get heavy rains and soil washes from the fruiting zone from the tops of beds. Having a significant amount of peanut foliage will soften the rain drops and reduce movement of soil and gypsum from the tops of rows.
Many growers will be making key decisions on herbicides this month. Keep in mind that fields often have ALS-resistant Palmer amaranth, and mixtures of imazapic (several formulations) with Ultra Blazer or Cobra need to be applied to match the PPO herbicides to make sure all of the Palmer amaranth is controlled (small weeds, less than 4 inches).
While injury from thrips will decrease with time, especially if we have good growing conditions, leaf hoppers can be issues in many fields given growers have moved away from chlorpyrifos to control root worms. A well-timed pyrethroid application will control this insect (make sure you treat active populations and not “the visible injury” from previous outbreaks). Growers are also determining whether or not chlorpyrifos is needed. And while it won’t be needed in many of our fields, using the risk index for this pest can help make sure risky fields are treated (entomologists in the region have developed an effective tool to help you with this decision). Keep in mind that application of chlorpyrifos under hot and dry conditions (and in fields that are at low risk for rootworm damage) can flare spider mites.
The variety Bailey has been planted on close to 80% of the Virginia market type acreage in the region, and this variety has a strong disease package. For this reason in many fields we do not need to start fungicide programs until the R3 stage of peanut growth and maybe even later in some situations. Your local Cooperative Extension agent and University pathologist can help with more detail of fungicide programs when we get to early July (just around the corner). In the upper V-C we have had good success with 4-spray programs.
There is a lot going on in June with peanuts! With all of it be as timely as possible and anticipate what will happen when you introduce a management practice.
Article first appeared as North Carolina Peanut Note (PNNC-2015-037)