Abstract
The green-belly stinkbug (Dichelops melacanthus) stands out due to its damage potential towards corn and wheat crops. The population distribution and size greatly influence the potential damage. The insect’s reproductive capacity depends on different temperature conditions during various crop seasons and its lifecycle. The study aimed to evaluate the influence of different constant temperatures on the D. melacanthus biology. The study was performed twice, once in the year of 2017, and again in 2019. The biological features were observed in temperature-controlled climate chambers with the following temperatures: 11, 16, 21, 26, 31 and 36 °C, each with a fluctuation of ±1 °C, using a RH of 65±15% and photophase of 14 h. The evaluations were conducted from eggs to adults in terms of: nymphal hatch period, each instar duration, female fecundity and egg viability. There were no eggs hatching at 11 ºC and it also reached 100% mortality during the second instar at 16 °C. The eggs-to-adult duration for the temperatures 21, 26, 31 and 36 °C in the trial of 2017 was 58.4, 30.1, 18.2 and 16.3 days, respectively. In the same temperatures, but during the 2019 trial, the eggs to adult duration was 58.1; 29.7; 21.3 and 19.1 days, respectively. The reproductive capacity in the temperatures of 21 and 36 °C impaired the female fecundity and egg viability. The temperatures 26 and 31 °C favored the development of D. melacanthus.
Highlights
Grain cultivation in Brazil is very competitive in the international market due to the possibility of more than one annual yield, using crop succession (CONAB, 2019)
The study aimed to evaluate the influence of six constant temperatures on the development time, female fecundity and egg viability of D. melacanthus with a controlled diet and photophase
The eggs used came from the Instituto Agronômico do Paraná (IAPAR) rearing of D. melacanthus and their collection was on the first day of each evaluation
Summary
Grain cultivation in Brazil is very competitive in the international market due to the possibility of more than one annual yield, using crop succession (CONAB, 2019). Its feeding in the vegetal tissues occurs through the insertion of its sucking apparatus, constituted by juxtaposed stylets, forming two channels: salivary and alimentary It can penetrate various plant structures, such as the stem, pod or seed, releasing its saliva with digestive enzymes, followed by the absorption of the liquefied cellular material (Chocorosqui, 2001). D. melacanthus has a hemi-metabolic development, consisting of the egg phase, followed by five nymphal instars, whose duration depends on the accumulation of degree-days, in direct relation with the exposed daily temperature (Pereira et al, 2007) Since it does not have diapause period, the study of its development under different climatic conditions throughout the year, allows for the estimation of its population growth and planning of actions for its management. The study aimed to evaluate the influence of six constant temperatures on the development time, female fecundity and egg viability of D. melacanthus with a controlled diet and photophase
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