Pseudaletia unipuncta

Isas, Marcos, L., María, Pérez, P., Salvatore, Analia, Gastaminza, Gerardo, Willink, Eduardo & White, William, 2016, Impacts of crop residue on damage by sugarcane pests during the tillering phase in Argentina, Florida Entomologist 99 (1), pp. 1-5 : 3

Pseudaletia unipuncta

The retention of crop residue resulted in significantly greater insect-inflicted damage in all locations and years; all unburned plots received damage by P. unipuncta . The treatment effect was the greatest source of variation (F = 107.3; df = 1; P <0.0001), greatly surpassing the year effect (F = 5.99; df = 2; P = 0.0027) and the location effect (F = 2.98; df = 2; P = 0.0538). The interactions year*treatment and location*treatment were significant at P <0.05 and P <0.10, respectively ( Table 1).

Damage by P. unipuncta was observed only in the “residue retained” treatment at the 3 locations evaluated during the entire period of the study. The 1-sample t -test showed that damage was significantly different from zero in all locations and years. The “residue burned” plots showed no damage by P. unipuncta during the course of the study. Maximum injury levels obtained were 9, 16 and 16% in Fronterita, Luisiana, and Simoca, respectively ( Fig. 1b ).

Figures

Fig. 1. Injury (proportion of damaged shoots) caused by Elasmopalpus lignosellus (a) and Pseudaletia unipuncta (b), for 2 harvest residue management schemes at 3 locations, 2011 to 2013.