| Plastic mulch planting technology has promoted agricultural production and efficiency,but the most commonly used polyethylene plastic mulch film can hardly be degraded in nature and can be stable in the soil for 200-400 years.At present,traditional abiotic treatment methods such as land filling and incineration cannot effectively degrade plastic,and such methods will cause secondary pollution to the environment.The use of biodegradable plastics is relatively more environmentally friendly.In this study,Galleria mellonella was used as the test object,and the different conditions of the breeding temperature and population density,the different types of polyethylene materials,and the different combinations of residual mulch film and artificial feed were used to study the effects of Galleria mellonella.The optimal breeding environment,the degradation efficiency of the larva of the Galleria Mellonella on different polyethylene materials,and the feeding rules of the larva of the Galleria Mellonella on residual mulch film and artificial feed in farmland.The main conclusions are:(1)Insect state duration of the has a tendency to shorten with increasing temperature.The growth and development of the Galleria mellonella took about 60-90 days,of which the egg stage is 5-18 days,and the larvae are 22-52 days,as well as the pupal stage are 5-12 days,and the adult period are 3-19 days.The life span of adult female of the Galleria mellonella was significantly shorter than that of males at different temperatures(P<0.05).During the growth process of the larva of the Galleria Mellonella,the changes in body weight and length showed that the growth of the Galleria Mellonella was accelerated with the increase of temperature.The amount of artificial feed(g):volume(cm3):the number of eggs(grains)in the indoor the Galleria Mellonella breeding is the largest number of larvae in the weight segment of 0.100-0.150g and>0.150g are obtained when the population density is 1:2.4:4.(2)Feed intake of different polyethylene materials with Galleria Mellonella is conventional food(feed,honeycomb)>residual mulch film(cotton,maize)>drip irrigation tape>PE powder>new film(PE film,degradation film).The feed intake of 10 larvae for 30 days on feed,honeycomb,cotton residual mulch film,corn residual mulch film,drip irrigation tape,PE powder,new PE film,new degradation film were 4.382 g,4.036 g,1.739 g,0.835 g,0.510 g,0.346 g,0.208 g,and 0.172 g,respectively.it can be seen that the amount of residual mulch film taken by the larvae is 6.8 times that of the new mulch film.The amount of common food(feed,honeycomb)consumed by Galleria mellonella increases with the increase of temperature.The amount of different polyethylene materials(residual mulch film,new film,drip irrigation tape)is the most at 30? and the least at 25?.Compared with the consumption of conventional food,the consumption of different polyethylene residual mulch film materials significantly increased the weight of adults and had no significant effect on the length of adults.Under different temperature conditions,the type of residual mulch film(cotton,maize)and the type of new mulch film(PE mulch film,degradable mulch film)had no significant effect on adult weight and length.The results showed that the effect of the feeding of different residual or new plastic mulch film on the growth of the Galleria Mellonella had nothing to do with the type of plastic mulch film.(3)The total weight of feeding food(feed+film residue)decreased with the increase of added amount of plastic mulch film residue when Galleria Mellonella fed on different ratio of feed and plastic mulch film residue.After the addition of artificial feed as supplementary nutrition,the feeding amount and feeding rate of the larva of the Galleria Mellonella to the polyethylene mulch film residue decreased,indicating that under the same conditions,compared with the polyethylene mulch film residue,larva of the Galleria Mellonella was more inclined to feed on the artificial feed. |
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