Citrus huanglongbing (HLB), or greening, is the most destructive citrus disease worldwide and is threatening the sustainability of the industry in major citrus-growing regions. Various treatments have been proposed in the literature to manage the disease. We review such literature and conduct an economic analysis based on the reported treatment effects on fruit yield and quality to identify cost-effective management strategies. Our results suggest that, among the treatments we reviewed, broad-spectrum insecticides provide the only cost-effective strategy for mitigating the impact of the disease. Our findings and discussion should help growers, policymakers, and other stakeholders make informed decisions in the search for effective, sustainable, and environmentally friendly treatments and policies against HLB.

The fruit and vegetable industry is an important segment of the U.S. agriculture. The 2017 U.S. Agriculture Census shows that the industry had total sales of USD 48 billion from over 10 million acres of land. However, over the last two decades, production of major fruit and vegetable crops in the United States has been declining while imports have grown significantly. The rapidly growing imports have posed challenges to the sustainability of the U.S. domestic industry. This study provides a systematic industry review of fresh fruit and vegetable production and trade between the United States and Mexico, by far the largest source of U.S. imports, highlighting the structural shift in the market over the last two decades and the caveats for industry sustainability. The analysis shows that Florida, Georgia, and California are among the states that face the strongest competition from Mexico. Among the 10 crops reviewed, berry, tomato, pepper, and cucumber production has been affected the most. The study further discusses the factors driving the rapid growth of imports and shows the importance of innovation and policy reform to the sustainability of the U.S. fruit and vegetable industry.

Huanglongbing (HLB) is a devastating citrus disease worldwide. A three-pronged approach to controlling HLB has been suggested, namely, removal of HLB-symptomatic trees, psyllid control, and replacement with HLB-free trees. However, such a strategy did not lead to successful HLB control in many citrus-producing regions, such as Florida. We hypothesize that this is because of the small-scale or incomprehensive implementation of the program; conversely, a comprehensive implementation of such a strategy at the regional level can successfully control HLB. To test our hypothesis, we investigated the effects of region-wide comprehensive implementation of this scheme to control HLB in Gannan region, China, with a total planted citrus acreage of over 110,000 ha from 2013 to 2019. With the region-wide implementation of comprehensive HLB management, the overall HLB incidence in Gannan decreased from 19.71% in 2014 to 3.86% in 2019. A partial implementation of such a program (without a comprehensive inoculum removal) at the regional level in Brazil resulted in HLB incidence increasing from 1.89% in 2010 to 19.02% in 2019. Using dynamic regression model analyses with data from both Brazil and China, we constructed a model to predict HLB incidence when all three components were applied at 100%. It was predicated that in a region-wide comprehensive implementation of such a program, HLB incidence would be controlled to a level of less than 1%. We conducted economic feasibility analyses and showed that average net profits were positive for groves that implemented the comprehensive strategy, but groves that did not implement it had negative net profits over a 10-year period. Overall, the key for the three-pronged program to successfully control HLB is the large scale (region-wide) and comprehensiveness in implementation. This study provides valuable information to control HLB and other economically important endemic diseases worldwide. [ ] Copyright © 2021 The Author(s). This is an open access article distributed under the CC BY-NC-ND 4.0 International license .

This paper models the U.S. strawberry market and examines how increasing imports from Mexico affect the prices and shipment values of California and Florida winter strawberries. The Synthetic Inverse Demand System is used to quantify the impact of Mexican shipments on the prices of strawberries. The estimation results indicate that market prices are responsive to supply from each of the three sources, suggesting an integrated, competitive national market. The simulation results suggest that rapidly growing Mexican shipments will cause large losses to the U.S. strawberry industry, posing challenges to the sustainability and survival of the industry, particularly that of the Florida industry. Policy implications and recommendations for the industry are discussed.

The Poyang Lake wetland has been at the center of discussion in China’s wetland restoration initiative because of the extent of its ecosystem degradation. The purpose of this paper is to model farmers’ willingness to participate in wetland restoration and analyze factors that will affect farmers’ participation decisions. A household survey was conducted among 300 randomly selected farm-households in the Poyang Lake area, Jiangxi Province. A binary probit regression model is applied to investigate the impacts of farmer demographics, farm characteristics, and farmers’ perceptions of wetland and wetland restoration policies on willingness to participate in wetland restoration. Results show that farmers’ education level, household migrant members, number of dependents, household net income, farm type, and distance to urban areas have significant effects on farmers’ participation in wetland restoration. Farmers’ perceptions about the ecological values and benefits of wetlands and their knowledge about wetland restoration policies do not appear to significantly influence farmers’ willingness to participate. A gap is identified between awareness of the importance of wetland restoration and willingness to take actions to restore wetlands. Farm-households tend to weigh personal needs and economic conditions when making participation decisions.