The Effect of Diet on Gypsy Moth (Lymantria &par) Larval Midgut pH, and Its Relationship with Larval Susceptibility to a Baculovirus
نویسندگان
چکیده
The midgut pH of gypsy moth (Lymantria dispar) larvae was significantly lower when larvae were fed acidic foliage. At 30 min after the start of a feeding bout, larvae feeding on bigtooth aspen (foliage pH = 6.04) had average midgut pH levels of 10.16, while larvae feeding on red oak foliage (foliage pH = 3.84) had average midgut pH levels of 9.36. Midgut pH was also significantly reduced when larvae were fed acidic artificial diets. At 30 min, average midgut pH levels were 9.80 and 9.42 for larvae fed diets buffered at pH 7 and 4, respectively. Larval susceptibility to the gypsy moth nuclear polyhedrosis virus was also significantly reduced when larvae consumed virus on highly acidic foliage and acidic artificial diets. Diet pH may affect virus activity by changing midgut pH and altering the rate and location of virion release in the midgut lumen. 8 1990 Academic press, IIIC.
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