Instability of fresh fruit and edible nut trade

Persea mite and avocado thrips are threatening avocado growers in California, where 90 percent of the nation's avocados are grown. Agricultural economists say that the combination of rising production costs, decreasing quality and increased market prices could result in increased imports from Chile and Mexico and total loss of the avocado industry in the U.S.
Aggravated by 
(E) Emanations of other problems