Scudderia cuneata (Orthoptera: Tettigoniidae)
southeastern bush katydid
short-horned grasshoppers in the family Acrididae.
United States: widespread in the eastern and southeastern United States. Also, California, Maine, and Texas.
Worldwide: United States.
Native to the United States.
sweet orange, Citrus sinensis
Feeds on very young fruit after petal fall causing distortion and a single circular scar on the fruit. Typically takes one bite of many fruits.
Ragged circular holes are formed.
The fork-tailed bush katydid produces one generation annually since the eggs require a rest period (diapause). Eggs are oviposited on the edges of tough, older citrus leaves in the summer and overwinter to hatch in the spring. Upon hatching, the katydids will first damage the flowers and then the highly susceptible young citrus fruit [5 - 15 mm (0.2- 0.59 in.)] in early spring and summer. Later in the season, as the fruit hardens, the katydids switch to feeding on new growth.
Katydids have excellent eyesight and when startled can hide behind leaves quickly.
Flint, M.L. 2008. U.C. pest management guidelines: citrus katydids. U.C. ANR Pub. 3441. (http://www.ipm.ucdavis.edu/PMG/r107300411.html).
Headrick, D. 2000. Fork-tailed katydid studies. Citrus Research Board 2000 Annual Report. (http://digitalcommons.calpoly.edu/cgi/viewcontent.cgi?article=1012&context=hcs_fac).
Martin, K.W., A.C. Hodges, and N.C. Leppla