More warmist disinformation: "Corn stops growing when the thermostat climbs to 86 degrees"

Agricultural climatologist helps farmers with climate change, saves cows

In her new position, under two different grants, [Pam Knox] is responsible for communicating with other extension climatologists and farmers about the potential repercussions of climate change on crop and livestock industries in Georgia.
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In her years of climatology experience, Knox has learned a lesson or two. Corn stops growing when the thermostat climbs to 86 degrees. Car dealerships lose 30 percent of their business on rainy days.

Iowa State: Growing degree-day calculation

Figure 1 demonstrates a generalized response of growth rate to increasing temperature. Growth begins at some minimum (in this case 50°F). The rate of development increases with rising temperature until it reaches a plateau at some optimum temperature (86°F in the figure). As temperature increases above the optimum the growth rate declines. The shape of this response curve is similar among many organisms; however, the minimum, optimum, and maximum temperature will vary.