Abstract
The objective of this work was to evaluate the oviposition preference of Diatraea saccharalis and the effect of ten sugarcane cultivars on larval development. Oviposition preference was assessed under greenhouse conditions by three releases of couples of moths, with subsequent counting of egg masses and eggs per plant. In order to evaluate the effect of the cultivars on larval development, each plant was infected with about 150 eggs, and, 29 days later, the total number of internodes, number of bored internodes, number of life forms found, larval and pupal weight and length, and the width of larval head capsule were evaluated. The cultivars IACSP94-2101 and IACSP96-2042, the least preferred by D. saccharalis for oviposition, and IACSP94-2094, the most unfavorable for larvae entrance and development, show resistance to the pest.
Highlights
The sugarcane borer Diatraea saccharalis Fabr. (Lepidoptera: Crambidae) is one of the most important pests of sugarcane in Brazil and is widely distributed in sugarcane belts across the country (Dinardo‐Miranda, 2008)
Ten cultivars were evaluated: IAC86‐3396, IAC91‐1099, IAC93‐3046, IACSP94‐2101, IACSP94‐2094, IACSP94‐4004, IACSP95‐5000, IACSP96‐3060, IACSP96‐2042, and SP91‐1115; the latter was used as a standard because it is susceptible to the borer and is largely grown in the state of São Paulo, Brazil
Some differences were observed between cultivars in relation to the number of eggs clusters, there were no significant differences between them in the three releases regarding the number of eggs laid
Summary
The sugarcane borer Diatraea saccharalis Fabr. (Lepidoptera: Crambidae) is one of the most important pests of sugarcane in Brazil and is widely distributed in sugarcane belts across the country (Dinardo‐Miranda, 2008). (Lepidoptera: Crambidae) is one of the most important pests of sugarcane in Brazil and is widely distributed in sugarcane belts across the country (Dinardo‐Miranda, 2008). Damage is caused by larvae tunneling into the stalks, causing the death of a large numbers of shoots, when the sugarcane plantation is young, and a sharp reduction in productivity, in more developed sugarcane crops. Secondary pests, such as Metamasius hemipterus (L.) (Coleoptera: Curculionidae), can infest sugarcane stalks through the holes made by the borer, increasing losses in the field. The presence of many microorganisms is common, especially of fungi that cause the “red rot” disease, which reduces sucrose content in stalks, due to its conversion into glucose and fructose. The microorganisms present in stalks contaminate the broth, hampering industrial processes, hindering the attainment of high‐quality sugar and inhibiting fermentation (Botelho & Macedo, 2002; Dinardo‐Miranda, 2008)
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