Se estudió la biología de Deroceras reticulatum a 12-18 ºC, en laboratorio. La experiencia se inició en cada temperatura con 20 babosas recién nacidas. Los individuos se criaron individualmente, alimentándolos con hojas de lechuga iLactuca saliva L.). Semanalmente se registraron longitud de cada babosa, mortalidad, oviposición e ingesta de cada individuo. Se identificaron 3 fases de desarrollo: la 1ra de crecimiento rápido, la 2da de crecimiento mas lento y la 3era de crecimientonulo a 18ºC y escaso a 12ºC. También se observaron diferencias en la 2da fase que alcanzó mayor duración a 12ºC. A 12ºC se observaron desoves a partir de la 3era fase de desarrollo mientras que, a 18ºC, no se registró oviposición. Aunque la longevidad promedio no fue significativamente diferente entre ambas temperaturas, fue mayor a 12"C con 221,2 días que a 18ºC con 192,8 días. La supervivencia no cambió en ambas temperaturas y la relación entre longevidad total y longevidad media fue 1,48: 1 ( 12ºC) y 1,81: 1 (18ºC). De las dos temperaturas evaluadas, 12ºC resultó la temperatura mas apropiada para el desarrollo de la población. El tamaño de D. reticulatum estuvo relacionado con el diámetro de las perforaciones producidas en las hojas de lechuga. Los individuos menores a 1 cm de longitud provocaron un raído de las hojas; los de 1 a 3 cm. perforaciones de 2 a 6 mm de diámetro aquellos de más de 3 cm, grandes perforaciones en las hojas.
Crop managcment practiccs can have a deep influence on the biological community of agricultura! systcms. Conservation-tillage practices disturb thc soil only cnough to insert thc secds, and a variety of studies documcnted that conservation-tillage results in more substancial lcaf littcr and large wced community, and tend to host more diverse comrnunities of soil organisms. However, most dangerous species of slugs, as Deroceras reticulatum, are epigea! herbivores that inhabit the soil surface, and have been cited causing damages on severa) crops. Since 1997, it was found in southeast Buenos Aires province, Argentina, on sunflower under not tillage systems. An assumption of our experiment is that Deroceras populations in South America may be genetically distinct because of ditferences in climate or colonization histories. The objective of this study was to determine the growth curve, reproduction, longevity, and survival of D. reticulatum, under controlled laboratory conditions at 12 ºC and 18 ºC. The experience was initiated at each temperature with 20 recently bom slugs. lndividuals were kept in 385 cm3 plastic boxes each and food consisted of leaves of lettuce Lactuca saliva L.). The length of each slug, mortality, egg-laying, and food ea ten by each individual on the leaf of lettuce were registered weekly. Three phases of development were identified: the 1 SI one was of fast growth, the 2"d one of slower growth, and the 3'd one with absence of growth at 18ºC and scarce growth at 12 ºC. Second phase was longer at 12 ºC. At 12 ºC, eggs were observed from 3rd phase of development whereas no egg-laying was recorded at 18 ºC. Although average longevity was not significantly different in both temperatures, longevity was greater at 12 ºC with 221,2 days than at 18 ºC with 192,8 days. The survival was not significantly ditferent with both temperatures and the relanon between total longevity and average longevity was 1,48: 1 (at 12ºC) and 1,81: 1 (at 18 ºC). Considering both temperatures studied, 12ºC resulted the most appropriate temperature for development of the population. The size of D. reticulatum was related with the diameter of the perforations in .ne Jettuce leaf; individuals smaller than I cm caused a frayed on the leaves, those specimens of 1 to 3 cm long made perforations between 2 and 6 mm diameter, and those ones longer than 3 cm have done great rPrforations on the leaves.
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