Project Summaries

11-832MS  Project Manager: P. F. O'Leary


Angus L. Catchot, Mississippi State University

In 2010 and 2011, early season yield loss from spider mites was evaluated based on duration of infestation. Spider mites typically infest cotton in along field borders or areas of the field with poor vegetation management. While little can be done to completely eliminate initial infestations, our data suggest that control measures should be taken within 7 days of initial infestations to protect yield. Populations allowed to persist for greater than 7 resulted in significant yield loss when initial infestation occurred on 3 node cotton. Spider mite dispersal data also supports these findings. Areas immediately adjacent to infestation points resulted in higher yield losses than those further away from infestation point. This is likely due to greater time spent near the initial infestation points. Spider mites were slow to move from infestation initial infestation point when environmental conditions were conducive (hot and dry). These data suggest that in the future, site specific management may potentially be utilized to make prescription application based on remote sensing data only to where mites occur in the field.

Corn earworm larvae collected from non-Bt corn and pyramided Bt corn hybrids were reared and reciprocal crosses made and placed on lyophilized Bt tissue collected from BollGard II cotton fields. LC50s were elevated in both crosses in which the female was collected on VT3P corn. There are a few functions that may be at play and determining the reason behind this observation will require further research. Given the current data set, it is unclear whether the mechanism responsible is a sex-linked trait or maternal influence. This research and crude analysis is preliminary and further steps are being evaluated in minutia in order to determine the exact mechanism of enhanced tolerance to dual-gene cotton.

Numerous tarnished plant bugs trials are being conducted in Mississippi to determine best management approaches for controlling this pest. Currently we have come up with some rotational guidelines that maximize control and minimize further resistance through repeated use of similar modes of action. A chart outlining suggested use strategies has been developed and is currently being used at producer and consultant meetings. This is to educated growers on sustaining older chemistries and where new chemistries fit in to our overall management approach for controlling tarnished plant bugs in Mississippi cotton.


Project Year: 2012

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