| Based on the principles of ecology and economics in pest management, this paper established the model of sustainable threshold St, proposed the definitions of ecological cost Ce,integrated cost Ci and so on, developed a new reference method surveying the pest-insects population density based on the critical point of St and tried to discuss the parameters for the model. This paper established the model of ratio of comprehensive cost to comprehensive profit RCCCP; comprehensive profit CP was classified into economic, social and ecological profit, while comprehensive cost CC was split into economic, social and ecological cost; matrix of RCCCP was calculated by dividing optimization matrix of CC by one of CP, model of RCCCP combined with AHP, grey theory and polygon synthesis indicator method were constructed; this paper suggest applying RCCCP to evaluate the rationality and scienticity for pest management.Comparison study on 2.2m, 2.7m, 3.2m high gray insect-proof net rooms, 2.7m white insect-proof thin film rooms and common pest-controlling areas without protection was established. Through systematic investigation, arthropod community 44 species (belonging to 29 families and 10 orders), pest-insects 18 species (belonging to 11 families and 7 orders), neutral insects 8 species (belonging to 7 families and 5 orders), natural enemies 17 species (belonging to 11 families and 6 orders), spiders 7 species (belonging to 4 families) were acquired; There is no significant difference on arthropod diversity index, evenness index and dominance index among 3 different high insect-proof net rooms; There is significant difference on arthropod diversity index among insect-proof net rooms, insect-proof thin film rooms and common pest-controlling areas, and the order is insect-proof net roomsï¹¥insect-proof thin film roomsï¹¥common pest-controlling areas; There is significant difference on arthropod evenness index among insect-proof net rooms, insect-proof thin film rooms and common pest-controlling areas, and the order is insect-proof net roomsï¹¥insect-proof thin film roomsï¹¥common pest-controlling areas; There is significant difference on arthropod dominance index among insect-proof net rooms, insect-proof thin film rooms and common pest-controlling areas, and the order is common pest-controlling areasï¹¥insect-proof thin film roomsï¹¥insect-proof net rooms. The dominant species of pest-insects in insect-proof net rooms and insect-proof thin film rooms were all Prodenia litura,Spodoptera exigua,Bemisia tabaci,Plutella xylostella, the dominant ones of neutral insects were Actaletidae sp.,Chironomidae,Culicidae, and the dominant ones of natural enemies were Pirata subpiraticus,Pardosa pseudoannulata,Erigonidium graminicola; The dominant ones of pest-insects in common pest-controlling areas were P. litura,S. exigua,B. tabaci,P. xylostella, the dominant ones of neutral insects were A. sp.,Culicidae, and the dominant ones of natural enemies were P. subpiraticus,P. pseudoannulata. Compared to common pest-controlling areas (merchandised insecticides 69.8g/667m-2 and active ones 9.36g/667m-2), merchandised insecticides reduced by 62.46% and active ones done by 58.97% in insect-proof thin film rooms, and merchandised ones reduced by 55.30% and active ones done by 50.96% in insect-proof thin film rooms.Study on technique for plant diversity techniques controlling insect-pests; the one is green vegetables intercropping soybeans in insect-proof thin film rooms, the other is green vegetables intercropping taros in insect-proof net rooms. The results indicated that a mean of 3.5 P. litura larvae and 0.33 eggs per soybean plant was observed, a mean of 1.3 P. litura larvae and 0.23 eggs per taro plant was done, and there were no significant difference among repetitions. There is significant difference on arthropod diversity, evenness and dominance index between intercropping areas and CK, the arthropod diversity and evenness index in intercropping areas are all higher than CK, while the dominance index are all lower than CK. The dominant species of pest-insects in intercropping soybeans were S. exigua,B. tabaci,P. xylostella, the dominant ones of neutral insects were Chironomidae,Culicidae, and the dominant ones of natural enemies were P. subpiraticus,P. pseudoannulata,E. graminicola; the dominant ones of pest-insects in CK were P. litura,S. exigua,B. tabaci,P. xylostella, the dominant ones of neutral insects in CK areas were Chironomidae,Culicidae, and the dominant ones of natural enemies were P. subpiraticus,P. pseudoannulata,E. graminicola; Compared to CK areas (merchandised insecticides 49.8g/667m-2 and active ones 7.86g/667m-2), merchandised insecticides reduced by 65.06% and active ones done by 59.54% in intercropping areas of insect-proof thin film rooms; The dominant species of pest-insects in intercropping taros were S. exigua,B. tabaci,P. xylostella, the dominant ones of neutral insects were A. sp.,Culicidae, and the dominant ones of natural enemies were P. subpiraticus,P. pseudoannulata; the dominant ones of pest-insects in CK were P. litura,S. exigua,B. tabaci,P. xylostella, the dominant ones of neutral insects were A. sp.,Culicidae, and the dominant ones of natural enemies were P. subpiraticus,P. pseudoannulata; Compared to CK areas (merchandised insecticides 89.8g/667m-2 and active ones 9.66g/667m-2), merchandised insecticides reduced by 65.26% and active ones done by 75.78% in intercropping areas of insect-proof net rooms. There is significant difference on pest-insects, natural enemies, neutral insects community number between intercropping soybean areas and CK; compared to CK, the number of P. litura reduced by 45.2%, S. exigua did by 29.2%, P. xylostella did by 1.2% and B. tabaci did by 46.2%, the total number of pest-insects did by 43.9%; the one of natural enemies increased by 32.7%, and the one of neutral insects did by 6.6%. There is significant difference on pest-insects, natural enemies, neutral insects community number between intercropping taro areas and CK; compared to CK, the number of P. litura reduced by 72.7%, S. exigua did by 50.0%, P. xylostella did by 52.5% and B. tabaci did by 40.0%, the total number of pest-insects did by 56.0%; the one of natural enemies increased by 71.4%, and the one of neutral insects did by 15.4%.Study on technique for sex attractants controlling vegetable insect-pests. The results indicated that an average of 120 P. litura moths, 62 S. exigua moths, and 45 P. xylostella moths per trap per day was captured. P. litura moths capture peaked from the second to last ten days of August in traps, and from the second to last ten days of December, highly done amounting to 234 moths per day; S. exigua moths capture peaked during the second ten days of August in traps, and from the first to last ten days of December, highly done amounting to 110 moths per day; decreasing number of P. xylostella moths occurred during the first ten days of August, but capture number varied sharply the second ten days of August afterwards, capture peaked during the second ten days of August, highly done amounting to 65 moths per day; There is significant difference on arthropod diversity, evenness and dominance index between combination areas and CK, the arthropod diversity and evenness index in combination areas are all higher than CK, while the dominance index are all lower than CK. The dominant species of pest-insects in sex attractant combination areas were P. litura,S. exigua,B. tabaci,P. xylostella, the dominant ones of neutral insects were Chironomidae,Culicidae, and the dominant ones of natural enemies were P. subpiraticus,P. pseudoannulata,E. graminicola; the dominant ones of no sex attractant rooms were P. litur,S. exigua,B. tabaci,P. xylostella, the dominant ones of neutral insects were Chironomidae,Culicidae, and the dominant ones of natural enemies were P. subpiraticus,P. pseudoannulata,E. graminicola; There is significant difference on pest-insects, natural enemies, neutral insects community number between combination areas and CK; compared to CK, the number of P. litura reduced by 40.9%, S. exigua did by 42.5%, P. xylostella did by 49.4% and B. tabaci did by 44.9%, the total number of pest-insects did by 49.4%; the one of natural enemies increased by 22.4%, and the one of neutral insects did by 10.3%.Compared to CK areas (merchandised insecticides 49.8g/667m-2 and active ones 7.86g/667m-2), merchandised insecticides reduced by 77.51% and active ones done by 76.59% in sex attractant combination areas of insect-proof thin film rooms.Study on technique for insect-killing lights controlling vegetable insect-pests. Study on insect-killing lights catching insects within continuous five days showed that insect communities caught by 0.8m high light is significantly more than ones by 1.3m high light, the pest-insect communities caught by 0.8m high light is also significantly more than ones by 1.3m high light, while the neutral insects and natural enemies are no significant difference between 0.8m high light and 1.3m one; light trap caught the most number of insects from 7P.M. to 1A.M.; light trap couldn't catch the natural enemies 2 A.M. afterwards; the ratio of natural enemies to pest-insects caught by 1.3m light trap is significantly higher than 0.8m light trap, one done by 0.8m light trap is 0.0692, while one done by 1.3m light trap is 0.1031. Study on insect-killing lights catching insects from July to September showed that insect communities caught by 0.8m high light is significantly more than ones by 1.3m high light, the main pest-insects caught by 0.8m high light is significantly more than ones by 1.3m high light, the natural enemies caught by 0.8m high light is significantly less than ones by 1.3m high light, while the neutral insects are no significant difference between 0.8m high light and 1.3m one; an average of 372.03 pest-insects per 0.8m high trap light per three days was caught, and an average of 306.94 pest-insects per 1.3m high trap light per three days was done; an average of 45.26 neutral insects per 0.8m high trap light per three days was caught, and an average of 44.16 neutral insects per 1.3m high trap light per three days was done; an average of 42.26 natural enemies per 0.8m high trap light per three days was caught, and an average of 48.19 natural enemies per 1.3m high trap light per three days was done; the ratio of natural enemies to pest-insects caught by 1.3m light trap is significantly higher than 0.8m light trap, one done by 0.8m light trap is 0.1177, while one done by 1.3m light trap is 0.1661.There is significant difference on arthropod diversity, evenness and dominance index between light trap areas and CK, the arthropod diversity and evenness index in light trap areas are all higher than CK, while the dominance index are all lower than CK. The dominant species of pest-insects in light trap areas were P. litura,S. exigua,B. tabaci,P. xylostella, the dominant ones of neutral insects were Chironomidae,Culicidae, and the dominant ones of natural enemies were P. subpiraticus,P. pseudoannulata,E. graminicola; the dominant ones of CK were P. litur,S. exigua,B. tabaci,P. xylostella, the dominant ones of neutral insects were Chironomidae,Culicidae, and the dominant ones of natural enemies were P. subpiraticus,P.pseudoannulata,E.graminicola; Compared to CK areas (merchandised insecticides 72.4/667m-2 and active ones 7.18g/667m-2), merchandised insecticides reduced by 63.81% and active ones done by 70.89% in light trap areas of insect-proof thin film rooms. There is significant difference on pest-insects, natural enemies, neutral insects community number between light trap areas and CK; compared to CK, the number of P. litura reduced by 51.7%, S. exigua did by 50.5%, P. xylostella did by 62.5% and B. tabaci did by 50.0%, the total number of pest-insects did by 55.7%; the one of natural enemies increased by 21.7%, and the one of neutral insects did by 10.0%.Basic principles and methods of polygon synthesis indicator was applied to construct RCCCP model and to evaluate pesticide reduction techniques in Shanghai protected horticultural vegetable fields; we divided pest-control functions into excellent, better, general, worse, much worse five criterion according to value of RCCCP caused by different pest-control methods. The result showed that the pest-control functions of treatments"2.2m high gray insect-proof net rooms"(RCCCP=0.4363),"2.7m high gray insect-proof net rooms"(RCCCP=0.4622) and"3.2m high gray insect-proof net rooms"(RCCCP=0.4786) were all excellent, while"white insect-proof thin film rooms"(RCCCP=0.5153) was general,"common control and prevention areas without any covering nets or thin films"(RCCCP=1.1001) was much worse; meanwhile treatment"2.2m high gray insect-proof net rooms"was our best pest-control technique.
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