COMMENT UN ARBORICULTEUR A ENTREPRIS LA LUTTE CONTRE LE PSYLLE DU POIRIER EN 1977.MANGUIN JP.1978; ARBORIC. FRUIT.; FR.; DA. 1978; VOL. 15; NO 288; PP. 37Article

PREBLOOM PETROLEUM OIL APPLICATIONS FOR DELAYING PEAR PSYLLA (HOMOPTERA: PSYLLIDAE) OVIPOSITION.A ZWICK RW; WESTIGARD PH.1978; CANAD. ENTOMOLOGIST; CANADA; DA. 1978; VOL. 110; NO 3; PP. 225-236; BIBL. 8 REF.Article

THE DEVELOPMENT AND BEHAVIOUR OF THE PEAR PSYLLA PSYLLA PYRICOLA (HOMOPTERA: PSYLLIDAE) ON DIFFERENT PEAR ROOTSTOCKS AND CULTIVARS.CHANG JF; PHILOGENE BJR.1976; PHYTOPROTECTION; CANADA; DA. 1976; VOL. 57; NO 3; PP. 137-149; ABS. FR.; BIBL. 7 REF.Article

POTENTIAL OF TREE WASHES AS A MANAGEMENT TACTIC AGAINST THE PEAR PSYLLABRUNNER JF; BURTS EC.1981; J. ECON. ENTOMOL.; USA; DA. 1981; VOL. 74; NO 1; PP. 71-74; BIBL. 14 REF.Article

LA LUTTE CONTRE LE PSYLLE DU POIRIER. ASPECTS NOUVEAUX.ATGER P.1978; ARBORIC. FRUIT.; FR.; DA. 1978; VOL. 15; NO 288; PP. 33-36Article

AERIAL APPLICATION OF DORMANT SEASON SPRAYS FOR CONTROL OF PSYLLA PYRICOLA OVERWINTERED ADULTS.BURTS EC.1976; J. ECON. ENTOMOL.; U.S.A.; DA. 1976; VOL. 69; NO 5; PP. 630-632; BIBL. 2 REF.Article

Observation, diapause induction and termination in Psylla pyricola in EnglandMUSTAFA, T. M; HODGSON, G. J.Bulletin SROP. 1984, Vol 7, Num 5, pp 125-138, issn 0253-1100Conference Paper

NEW RECORDS OF PARASITIC CHALCIDOIDS OF PEAR PSYLLA (HOMOPTERA: PSYLLIDAE) IN ONTARIO, WITH OBSERVATIONS ON THE CURRENT WORLD STATUS OF ITS PARASITOIDS AND PREDATORS.PHILOGENE BJR; CHANG JF.1978; PROC. ENTOMOL. SOC. ONT.; ISSN 0071-0768; CAN; DA. 1978; VOL. 109; PP. 53-60; BIBL. 2 P.Article

METHOD FOR REARING THE PEAR PSYLLAFYE RE.1981; J. ECON. ENTOMOL.; USA; DA. 1981; VOL. 74; NO 4; PP. 490-492Article

PERFORMANCE OF SELECTED INSECTICIDES AGAINST PEAR PSYLLA, PSYLLA PYRICOLA FOERSTER (HOMOPTERA: PSYLLIDAE)BODE WM.1978; J. NEW YORK ENTOMOL. SOC.; ISSN 0028-7199; USA; DA. 1978; VOL. 86; NO 4; PP. 279Conference Paper

RESPONSE OF PSYLLA PYRICOLA (HOMOPTERA: PSYLLIDAE) TO, AND CHARACTERIZATION OF POLAR AND LIPID FRACTIONS OF PYRUS SP. LEAVES.CHANG JF; PHILOGENE BJR.1978; PHYTOPROTECTION; CANADA; DA. 1978; VOL. 59; NO 1; PP. 28-39; ABS. FR.; BIBL. 21 REF.Article

GREENHOUSE TESTING OF PEARS WITH PYRUS USSURIENSIS LINEAGE FOR RESISTANCE TO PSYLLA PYRICOLA = ESSAI EN SERRE DES POIRIERS DE LIGNEE P. U. POUR LA RESISTANCE A P. P.HARRIS MK.1976; J. ECON. ENTOMOL.; U.S.A.; DA. 1976; VOL. 68; NO 5; PP. 641-644; BIBL. 3REF.Article

Seasonal susceptibility to insecticides in insecticide-resistant pear psylla, Psylla pyricola (Homoptera: Psyllidae)VAN DE BAAN, H. E; WESTIGARD, P. H; BURTS, E. C et al.Crop protection. 1989, Vol 8, Num 2, pp 122-126, issn 0261-2194Article

Observations on the effect of photoperiod on the control of polymorphism in Psylla pyricolaMUSTAFA, T. M; HODGSON, C. J.Physiological entomology. 1984, Vol 9, Num 2, pp 207-213, issn 0307-6962Article

IMPACT OF FENVALERATE AND DIFLUBENZURON ON TARGET AND NONTARGET ARTHROPOD SPECIES ON BARTLETT PEARS IN NORTHERN CALIFORNIARIEDL H; HOYING SA.1980; J. ECON. ENTOMOL.; USA; DA. 1980; VOL. 73; NO 1; PP. 117-122; BIBL. 11 REF.Article

DISPERSION STATISTICS AND SEQUENTIAL SAMPLING PLANT FOR ADULT PEAR PSYLLABURTS EC; BRUNNER JF.1981; J. ECON. ENTOMOL.; USA; DA. 1981; VOL. 74; NO 3; PP. 291-294Article

EFFECT OF PREBLOOM OIL APPLICATIONS ON PEAR FRUIT SET AND THE POSSIBLE MODE OF ACTIONLOMBARD PB; WESTIGARD PH; ZWICK RW et al.1981; HORTSCIENCE; ISSN 0018-5345; USA; DA. 1981; VOL. 16; NO 1; PP. 54-55; BIBL. 7 REF.Article

PEAR PSYLLA: POPULATION SUPPRESSION THROUGH HOST PLANT MODIFICATION USING DAMINOZIDEWESTIGARD PH; LOMBARD PB; ALLEN RB et al.1980; ENVIRON. ENTOMOL.; ISSN 0046-225X; USA; DA. 1980; VOL. 9; NO 3; PP. 275-277; BIBL. 11 REF.Article

VARIATION IN PEAR PSYLLA (PSYLLA PYRICOLA FOERSTER) DENSITIES IN SOUTHERN OREGON ORCHARDS AND ITS IMPLICATIONSGUT LJ; JOCHUMS C; WESTIGARD PH et al.1982; ACTA HORTICULTURAE; ISSN 0567-7572; NLD; DA. 1982; NO 124; PP. 101-111; BIBL. 17 REF.Conference Paper

CODLING MOTH: CONTROL ON PEARS WITH DIFLUBENZURON AND EFFECTS OF NON TARGET PEST AND BENEFICIAL SPECIESWESTIGARD PH.1979; J. ECON. ENTOMOL.; USA; DA. 1979; VOL. 72; NO 4; PP. 552-554; BIBL. 10 REF.Article

EFFECTS OF OVERTREE IRRIGATION ON DENSITY AND DAMAGE OF PEAR PESTSWESTIGARD PH; LOMBARD PB; ALLEN RB et al.1979; J. ECON. ENTOMOL.; ISSN 0022-0493; USA; DA. 1979; VOL. 72; NO 6; PP. 839-840; BIBL. 4 REF.Article

EFFECTS OF TWO SYNTHETIC PYRETHROIDS ON THE CODLING MOTH, PEAR PSYLLA, AND VARIOUS MITE SPECIES IN NORTHWEST APPLE AND PEAR ORCHARDSHOYT SC; WESTIGARD PH; BURTS EC et al.1978; J. ECON. ENTOMOL.; ISSN 0022-0493; USA; DA. 1978; VOL. 71; NO 3; PP. 431-434; BIBL. 6 REF.Article

EINIGE ASPEKTE ZU BIOLOGIE, AUFTRETEN UND BEKAEMPFUNG VON BIRNENBLATTSAUGERN (PSYLLA SPP.) UNTER BERUECKSICHTIGUNG DER BEDINGUNGEN IM BEZIRK POTSDAM = QUELQUES ASPECTS CONCERNANT LA BIOLOGIE, LA PRESENCE ET LE CONTROLE DE P. DANS LES CONDITIONS DU COMTE DE POTSDAMSCHWARZ D.1982; NACHRICHTENBL. PFLANZENSCHUTZ DDR, BERLIN; DDR; DA. 1982; VOL. 36; NO 11; PP. 214-216; ABS. ENG/RUS; BIBL. 6 REF.Article

NEUES VOM INTEGRIERTEN UND BIOLOGISCHEN PFLANZENSCHUTZ = DEVELOPPEMENTS RECENTS DANS LE DOMAINE DE LA LUTTE INTEGREE ET DE LA LUTTE BIOLOGIQUEFRANZ JM.1978; ERWERBSOBSTBAU; DEU; DA. 1978; VOL. 20; NO 7; PP. 144-147; BIBL. 7 REF.Article

The dispersal and flight activity of Psylla pyricola Förster in Southern EnglandHODGSON, C. J; MUSTAFA, T. M.Bulletin SROP. 1984, Vol 7, Num 5, pp 97-124, issn 0253-1100Conference Paper