home   license   contact   acknowledgements   how it works

CARMA provides advice about both rangeland and cropland grasshopper infestations.


CARMA's rangeland module uses case-based reasoning to produce advice about the most economical responses to grasshopper infestations based on roughly 140 combined years of entomologist expertise shared among eight experts. CARMA does this by predicting the proportion of available forage that will be consumed by grasshoppers and estimating the economic returns of various treatment options. Tests have shown that CARMA's grasshopper forage consumption predictions, which are the core of determining the best course of action, very closely approximate the median predictions of the experts. CARMA gives advice by comparing the current infestation to previous infestations (i.e., cases) and adapting the recommendations of the experts to fit the current infestation. The information required to make the forage loss prediction includes the date, the infestation location, the range value and infestation history of the location, the number of grasshoppers per square yard, the grasshopper type and age distribution, the relative recent precipitation and temperatures, and the total area infested (including adjacent neighbors' lands). Infestation probabilities for your location and the effectiveness of each treatment type are used to predict the future probabilities of re-infestation for each treatment type, and statistical methods are used to predict the range of economic benefits for each treatment option. Finally, a set of rules are used to select the possible treatments.


CARMA also includes a prototype crop protection module that gives advice about cropland grasshopper infestations using accepted cropland protection rules.

Further information about CARMA is contained in the following sources:

2002-2015 John Hastings