The Occurrence Increase And Decrease Rule Of Chrysopa Pallens(Rambur) On Tobacco And Its Applied Research

In the Red River state,life history of chrysopa pallens(Rambur),generation number,the biology characteristic,the life habit,the rule on the smoke field and other crops' increase and decrease,and artificial feed formula raising,the preying function to the smoke aphis and so on were shudied.Meanwhile,the effect on smoke aphis[Myzus persicae(Sulzer)]control by Chrysopa perla was investigated.The main results were as fellows:1.Chrysopa perla type:In the Red River state mainly is the chrysopa pallens(Rambur), next was the Chrysopa formosa(Brauer).The chrysopa pallens(Rambur) life history,the Maitreya religion chrysopa perla generation was 5-6 generation.Mengtze's chrysopa perla generation number are more than 1-2 generation Maitreya religion.2.The chrysopa pallens(Rambur) biology characteristic,the prosopon from a cocoon grain of emergence,after 2-5 minute,took off in vitro transparent colloidal film.The wing had not launched,launched the wing gradually after more than 10 minutes crawling and the change.Daytime and the evening can move,the soaring strength was very strong,6- was 6- in August most abundant in 21-23 activity.After several day supplement nutrition stage,achieved the nature was mature,starts the copulation to spawn.In outdoor investigation,evening was illuminating the observation with the sufficient electric lamp and the flashlight,a prosopon average took in 30-45 second eats an ophid,the prosopon has the strong photoaxis,evening may gather many prosopons with the flare.Daytime and the evening all could spawn,but general many 9 o'clock spawns in the evening to 12 o'clock.Produces happy on the tobacco in at the back of the smoke middle leaf tobacco,picks in the flue-cured tobacco roasts the later period, produces happy on the smoke pitchfork,the flower bud,the fruit and flowers.In raises in the bottle to produce happy on the bottle mouth gauze,around the bottle mouth spawns.The prosopon had takes the food from the habit which spawns,when feed the insufficiency and the raising density big displays the outstandingly.The prosopon took the appetite to be big.3.Chrysopa pallens(Rambur) egg color change process.Did to the different generation's chrysopa perla egg color change process many observed the record.4.The chrysopa pallens(Rambur) larva responded to the game density function,chrysopa pallens(Rambur) various ages larva to low age if aphis's instantaneous attack rate infinite wide difference,but the process time is different,ages,2 ages obvious short in 1 age.The insect body is bigger,the process time is shorter.The chrysopa pallens(Rambur)1 age,2 ages,3 age larva preys on the quantity to increase along with the smoke aphis density increase.The test result indicated that,along with the initial smoke aphis density ascension,the chrysopa pallens(Rambur)each activity insect time individual daily average preys on the quantity to assume the drag acceleration curve pattern growth.The curve conforms to Holling-â…¡Function response model.Explained the chrysopa pallens(Rambur) was away from and the energy to the smoke aphis's discovery grows along with the age;Grows along with the big Grows along with the chrysopa larva stadium,its process time Th value reduced pallens(Rambur)5.Chrysopa pallens(Rambur) in smoke field occurrence rule,chrysopa pallens(Rambur) insect egg,larva.The cocoon grain assumes the split-blip in the smoke field occurrence rule, namely from prosperous to picks for a long time roasts the time,picks roasts the later period[Myzus persicae(Sulzer)].Increases along with smoke aphis[Myzus persicae(Sulzer)]. population quantity increases.Chrysopa pallens(Rambur) on other crops increase and decrease rule,was also same on other crops,the followed ophid is close,along with the climate,feed the change to change,but the chrysopa pallens(Rambur) only takes the food ophid on some crops to spawn,but some had ophid's crops not to take the food to spawn.6.Chrysopa pallens(Rambur) had the medicine field occurrence rule in non-medicine Tian Yu to compare.The non-medicine field,from from at the beginning of June was the chrysopa pallens(Rambur) spawns to the beginning of July to the peak development time,but had the medicine field actually drops the tendency from mid-June.7.Raises in the insect net awning the chrysopa pallens(Rambur)to the smoke aphis[Myzus persicae(Sulzer)].the control effect was quite obvious.Raises the insect net awning the shortcoming is above had not covered the canopy,the chrysopa pallens(Rambur) and the smoke aphis[Myzus persicae(Sulzer)],receives the rain water certain influence.8.Through the room in the medicament experiment and the field medicament experiment, the organic agricultural chemicals 50%methylamine phosphorus,20%good year winter were high to the smoke aphis[Myzus persicae(Sulzer)].lethality,very were also high to chrysopa pallens(Rambur) lethality.Biological agricultural chemicals 35%Germany Masurium had certain function to the smoke aphis[Myzus persicae(Sulzer)].,the double-effect-Bt function was not big.Explained biological agricultural chemicals double-effect-Bt,35%German Masurium to the natural enemy chrysopa perla is safe,had certain function to the tobacco harmful insect,might apply in the production.The biological agricultural chemicals to oriental tobacco budworm's killing action of force are big.