Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

The damage and its grading standard of different varieties of late summer maize caused by Spodoptera frugiperda.

Abstract

Spodoptera frugiperda (J.E. Smith) is an important polyphagous pest invading to China in recent years. In this paper, trivalent insect-resistant and herbicide-tolerant genetically modified maize "Double-resistant 12-5" (Cry1Ab+Cry2Aj+epsps), transgenic insect-resistant and herbicide-tolerant genetically modified maize "C0030.3.5" (Cry1Ab+epsps) and their corresponding control varieties "Hongshuo 899" and "C0010.1.1" were used as materials. Twelve plots(200 m2 per plot) were designed in accordance with randomized block. The number and instar of larvae, leaf damage, tasseling rate and silking rate of maize in each plot were investigated, and the maize yield of each plot was measured. The results showed that the damage caused by S. frugiperda was serious, the yield loss of conventional control maize varieties was 62.98% ("Hongshuo 899"), 65.42% ("C0010.1.1"); the yield loss of genetically modified maize was 53.34% (DR12-5) and 13.31% ("C0030.3.5"); the silking rate of two control maize varieties was less than 60% due to the damage of S. frugiperda; according to the damage to maize leaves, population density and loss of maize yield, the grading standards of light occurrence and were damage, medium to light occurrence and damage and outbreak and so on for occurrence and damage of S. frugiperda framed, which provides a theoretical basis for the rapid and accurate forecast and effective control of S. frugiperda.