>Byron: thanks for clarifying the mobility question. Its useful to know that
>rootworm and borer are sufficiently mobile that rotation is not a meaningful
>approach. What I'm not clear on is what other managerial approaches may be
>effective in dealing with rootworm and cornborer, apart from rotation. Does
>residue incorporation help? Timing of planting? Thanks. Ann
Ann, In the case of Corn or Soybeans, plant vigor plays a major role in the
severity, or lack there of, by Southern Corn Rootworm.
For Peanut pods/nuts stage of maturity from early August - early September is
critical in normal years. If weather conditions delay maturity, ie..drought,
cool temps early season, early season thrips damage, or any number of factors
that delay maturity then mid August - mid September becomes the critical dates
for attack by Southern Corn Rootworm . Normally after first week of Sept. the
harvestable pods are mature enough that the larval stage can not damage the
crop. Under poor early season conditions, any pod/nut that is not mature enough
to withstand attack through mid Sept. probably will not mature before freezing
temps stops the maturity process.
So early season plant vigor is important in culturally winning the race with
this insect in peanuts. But here again there are other factors that also play a
role such as soil color, texture, moisture. This insect/soil/weather
interaction is extremely complex in Peanuts in NC.
For European Corn Borer, destruction of host crop residues in the fall greatly
reduces the number of insects over wintering. This also aids in the control of
Tomato/Tobacco Hornworms for next season. However, if I am the only one in my
community that does this practice then there is not much of a benefit.
Research done in the '70s showed that crop destruction in the fall by mowing
was better than disking. Mowing is very expensive in time, fuel, & parts.
-- Byron Simonds E-Mail : bsimonds@hertford Internet: firstname.lastname@example.org Phone : (252) 358-7822 Fax : (252) 358-7880
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