Test showed that:0 5%Abamection had better control effect against Plutella xylostella L ,During1～5 days It's control effect could reach 91 24%～93 83% with 0 4～0 5g Key words:Abamectin Plutella xylostella L Control effect
The results of toxicological test showed that abamectin-Bacullus thuringiensis WP had remarkable synergistic effect on Plutella xylostella L in green-house, and its co-toxicity coefficient was 150 1 The control effect against Plutella xylostella L was 66 3%～85 2% on the third day after treatment, 86 1%～95 6% on the 7th day after treatment at the rate of 1125～1500ghm -2 in field
③if the plants were inoculated with an-thracnose pathogen,Colletotrichum higginsianum,immediately after spraying BS-2 suspension,the best control effect was obtained,the effects in the third and sixth day were 95.12% and46.71% respectively;
The results showed that the control effect of beta-cypermethrin 4.5% EC 20-30mL together with phoxim 40% EC 50mL per 667m2 against Spodoptera litura before 4th instar within 1 -7days after spraying were 90% , which were better than that of chlorfenapyr 10% SC 50mL per 667m2. The mixtures were economical, effectual and safe, and especially suitable for non-polluted vegetable use.
Their suitable concentrations for field spraying are 3 500 - 4 500,3 500-4 000,3 000-4000 and 2000-3000 times, respectively. The corresponding control effects are 88.6% - 91.2% ,87.6% - 90.7% ,86.7 - 87.2% and 85.2% -86.9% .
In laboratory test,the toxicity of G_P 1:400 dilution to six species of aphids tested after 48h was 92.4%～97 9% and the half lethal concentration of G_P insecticide to six species of aphids was 1:1620～2008.In the field tests,the control effects of G_P 1:400 dilution to aphids on cotton and fruit trees were 91.1%～96 8%.
The 24%Yiqing EC which is a new combined for-mulation of organophosphorus and pyrethroid insecticides,have high synergisrn to control diamondback rnoth,Plutellaxvlostella(L.) ,The co-toxicity coefficient exceeds 260.Thecontrol effects of combined formulation in fields are between82.5%and 94.5%, whereas the cornponents by thernselveshave lower control effects between 7.3%and 67.9%.
Flutter control effect and mechanism of central-slotting for long-span bridges
The control effect of central-slotting depends on the aerodynamic configuration of the original girder section and the corresponding central-slotting width.
The control channel is divided into two channels (fast and slow) for enhancing the speed of response at a significant range of the control effect.
Simulation results indicated that the proposed controller exhibits satisfying control effect.
The activities of enzymes responsible for lignification in pepper, pre-inoculation with arbuscular mycorrhizal (AM) fungus ofGlomus intraradices and/or infection with pathogenic strain ofPhytophthora capsici, and the biological control effect ofG.
However, the absence of pronounced control effects of most metabolites on the studied enzymes allows us to assign them to a relatively inert pool of metabolites.
Several different types of porous wall/cavity systems are tested to investigate the passive control effects.
The two logics have been tested under various driving conditions to investigate their control effects.
A model is described that allows one to compensate for the influence of perturbing factors and mutual influence of control effects on neighboring regions.
The wind-control effects of shelterbelts with different structures (close-spaced, wider-spaced, and widest-spaced) were investigated by portable wind vane and anemometer, wet and dry bulb thermometer, ground thermometer, glass service instrument.
Protease inhibitors, trans-epoxysuccinyl-L-leucylamido-(4-guanidino)butane (E64), antipain hydrochloride, and a mixture of inhibitors, but not pepstatin A, fully or partially nullified the biocontrol effect of T39.
atrum, resulting in a biocontrol effect, only takes place in necrotic plant tissue.
Evaluation of biocontrol effect of wild-type and mutant Trichoderma strains on the development of Botrytis cinerea disease symptoms on bean leaves.
Evaluation of biocontrol effect of wild-type and mutant Trichoderma harzianum strains on bean seeds in Rhizoctonia solani-infested soil.
Several bacteria that exhibit a biocontrol effect on some common bean pathogens have been isolated in our laboratory.
Experiments were conducted to study the susceptibility of 3 species of rangeland grasshopper to Nosema locustae in Xinjiang. Result showed the susceptibili ty of Dociostaurus kraussi was 86.3%, but that of Caliiptamus italicus a nd Gomphocerus sibiricus were 34.5% and 17.7% only. Adding 4 ml of 50% mala t ion to 100g Nosema locustae bran, the rate of population reduction of Cali iptamus italicus was 76.7%, which was much higher than that of using Nosema locustae alone. It seems...
Experiments were conducted to study the susceptibility of 3 species of rangeland grasshopper to Nosema locustae in Xinjiang. Result showed the susceptibili ty of Dociostaurus kraussi was 86.3%, but that of Caliiptamus italicus a nd Gomphocerus sibiricus were 34.5% and 17.7% only. Adding 4 ml of 50% mala t ion to 100g Nosema locustae bran, the rate of population reduction of Cali iptamus italicus was 76.7%, which was much higher than that of using Nosema locustae alone. It seems that in a moderate grasshopper year, only applying Nosema locustae bran would suppress the population density under the control i ndex (10 head/m 2). But, in the years of grasshopper outbreak, Nosema locusta e bran should be mixed with small dosage of insecticide tp improve the control effect.