Grogan, Kelly A.

English

Research Papers in Economics

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Poster prepared for presentation at the Agricultural & Applied Economics Association’s 
2011 AAEA & NAREA Joint Annual Meeting, Pittsburgh, Pennsylvania, July 24-26, 2011 
[Preliminary Draft] 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Copyright 2011 by Kelly A. Grogan. All rights reserved. Readers may make verbatim 
copies of this document for non-commercial purposes by any means, provided that this 
copyright notice appears on all such copies. Preliminary results.  Please do not cite. 
!Commercial Citrus or a Really Big Backyard: 
Small Citrus Growers and their Effects on Citrus Pest Populations 
Kelly A. Grogan 
Food and Resource Economics, University of Florida 
Motivation: 
The majority of California citrus growers manage less than 
15 acres of citrus.   
A  2010  survey  of  citrus  growers  revealed  that  smaller 
growers are less likely to report the presence of major citrus 
pests and are less likely to treat pests that they report as 
present. 
Research Questions: 
-  How  do  pest  presence  and  pest 
management decisions differ between large 
and small growers? 
-  Does a clear size cutoff exist between large 
and small? And if so, what is this cutoff? 
-  If small growers less actively manage their 
farms, how does this affect growers who do 
actively manage their farms? 
Methods: 
-  Using data from the 2010 survey of citrus 
growers: 
-  Estimate  probit m o d e l s  f o r  p e s t  
presence  and  chemical  control, 
controlling  for  grower  and  farm 
characteristics  and  surrounding  pest 
presence and treatment. 
-  Vary  division  between  large  and  small 
growers. 
-  Separately  estimate  pest  presence  for 
large  growers,  controlling  for  the 
presence of inactive small growers. 
Map of Red Scale Presence Reported 
By Small Growers, Forthcoming 
Map of Red Scale Presence Reported 
By Large Growers, Forthcoming 
Map of Red Scale Treatment Reported 
By Small Growers, Forthcoming 
Map of Red Scale Treatment Reported 
By Large Growers, Forthcoming 
Results: 
Pest Presence 
-  Increasing the percent of surrounding 
citrus  that  has  reported  red  scale 
present increases the probability that 
grower i reports red scale present by 
37-58%. 
-  No size threshold detected. 
-  Graduate  degree,  and  obtaining 
income  from  other  growers  or 
chemical  suppliers  are  associated 
with  a  decreased  likelihood  of 
reporting pest present. 
-  Percent  of  total  household  income 
from  citrus  production  is  associated 
with  an  increase  in  likelihood  of 
reporting pest present   
Results: 
Pest Treatment 
-  As the percent of surrounding citrus 
acreage  treated  for  red  scale 
increases,  small  growers  are  less 
likely  to  treat  for  it,  relative  to  large 
growers. 
-  True for divisions at 5, 10, 15, and 
20 acres 
-  As the percent of household income 
derived  from  citrus  increases, 
growers are more likely to treat. 
-  Female  growers  are  less  likely  to 
apply  chemical  controls  than  male 
growers  while  Asian  growers  are 
more likely to apply chemical controls 
than white growers.   
Results: 
Externalities 
-  Results are forthcoming 

Commercial Citrus or a Really Big Backyard: Small Citrus Growers and their Effects on Citrus Pest Populations

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