<div>Growth and development of acridid grasshopper, Chrotogonus trachypterus Blanchard was greatly influenced by different levels of temperature (20, 25, 30, 35 and 37oC) and relative humidity (40, 60 and 70%). A laboratory study was revealed that temperature between 30-35oC with 60% relative humidity is mostly suitable for life cycle of the test insect. Maximum oviposition period was 54.6&plusmn;2.21 days at 25oC whereas, maximum hatching percent was recorded at 30oC (90.6&plusmn;1.18). Average fecundity of a female increased with the increase in temperature up to 35oC (242.1&plusmn;2.55) but decreased at 37oC. Developmental period of nymphs was longer at 20oC as 94.03&plusmn;3.45 and 105.3&plusmn;3.16 days for males and females whereas, nymphs quickly developed at 37oC within 50.3&plusmn;0.55 and 60.2&plusmn;2.44 days, respectively. Highest survivability was obtained at 25o and 30oC. Relative humidity ranged from 60-70% gave non-significant differences and found to be most suitable for insect growth. Study of interaction of ecological factors will be helpful in management strategy of the pest and future adaptation behavior and outbreak issues.</div>

<div>Effect of Temperature and Relative Humidity on the Growth and Development of Acridid Grasshopper, Chrotogonus trachypterus Blanchard &nbsp;</div>

<div style="text-align:justify">Background: The vegetable leafminer, Liriomyza sativae (Blanchard) is a serious pest of vegetable and ornamental crops in the whole Vietnam. Previous studies indicate that biology of Liriomyza leafminers depends on host plant. The objective of this study was to understand the performance of L. sativae on kidney bean (Phaseolus vulgaris L.) and pak choi (Brassica rapa var. chinensis). 
 
Methods: The experiment was carried out at the Laboratory of Entomology, Faculty of Agronomy, University of Agriculture and Forestry, Hue University, Vietnam during 2020 and 2021. The development time of immature stages, longevity and fecundity of L. sativae were investigated on kidney bean and pak choi. 
 
Result: The total developmental time from egg to adult emergence of the vegetable leafminer fed on kidney bean was shorter (17.1 days) than that on pak choi (18.2 days). Fecundity of the adults on kidney bean (190.2 eggs) were larger than that on pak choi (73.3 eggs). The results indicated that pak choi was less suitable host plant than kidney bean.</div>

Biology of the Vegetable Leafminer, Liriomyza sativae (Blanchard) (Diptera: Agromyzidae) on Kidney Bean (Phaseolus vulgaris L.) and Pak Choi (Brassica rapa var. chinensis)