Dr. Belen M. Rejesus is an internationally acclaimed plant entomologist. She conducted basic bio-ecological research component analysis (biology, economic threshold level, etc.) and sought behavioral or less environmentally disruptive alternation pest control methods. She also developed IPM schemes for several stored products like coffee, corn and cruciferous pests that eventually became the bases for IPM recommendations for stored product and corn pests in the Philippines and in Southeast Asia. Dr. Rejesus pioneered and demonstrated the potential of local plants and endogenous insect regulators as pest control agents. The results of her early researches on insecticide plants laid the foundation for all other studies pursued by other scientists in the Philippines and other parts of the country.

Sex: Female

Education:

    • University of Hawaii, USA, MS Entomology, 1966
    • UPLB-CA, Los Baños, College, Laguna, BS Agriculture, 1966
    • Rutgers University, Ph.D. in Entomology, 1969

Field of Specialization:

Entomology, Integrated Pest Management

Researches:

    • Rejesus, Belen M., (2000) Technology transfer of cotesia-based IPM for diamondback moth on Lowland elevated crucifers in Luzon.
    • Philippine Entomology Volume 14, No. (1):
    • Rejesus, B.M., (1999) Effect of Aristolochia extracts on the Diamondback moth Plutella xylostella (L).
    • Philippine Entomologist Volume 13(1)
    • Rejesus, B.M., (2000) Selectivity of Acephate and Prophapos to the world spider, Pardosa pseudoannulata (Boes et Strand and Brown Planthopper Nilaparvata lugens (Stal) Part I. Toxicity, anticholinesterase activity and bioactivation.
    • Philippine Agricultural Scientist Volume 83(3);
    • Rejesus, B.M., (2000) Biological studies of Aphytis sp. nr. Chrysophali (Hymenoptera: Aphelini-dae).
    • Philippine Entomology Volume 14, No. (2):
    • Cendaña, S.M. Rejesus, B.M., (1960) Behavioral characteristics of rice stemborers in the Philippines.
    • Proc., 4th Conference FAO Community Plant Protection, SEAR Working Paper , No. 18
    • Bannag, A.F. Bandong, P.O. Rejeus, B.M. Bandong, F.M., (1962) Comparative effectiveness of two formulations of DDT and 2 levels of sevin for sack treatment in the control of stored grain insects.
    • Agriculture at Loa Ba?os Volume 1, No. (3);
    • Rejejus, B.M. Banaag, A.F., (1963) Tomato pests.
    • Agriculture at Los Ba?os Volume 3
    • Rejesus, B.M. Sherman, M., (1967) Toxicology and cholinesterase activity of four organophosphorous compounds to four species of flies.
    • Journal of Economic Entomology Volume 60
    • Rejesus, B.M. Chow Sanchez, F.F. Cadapan, E.P., (1972) Malathion and phosdrin in residues in pechai.
    • Philippine Entomologist Volume 2, No. (4):
    • Rejesus, B.M., (1972) Survey of Philippine population of rice weevil (Sitophilus oryzae for the resistance to insecticides.
    • Proc., 3rd Annual Conference, Intensified Corn Production Program, UPLB, College, Laguna
    • Sanntony, D. Rejesus, B.M., (1972) Toxicity of six organophosphorous insecticides to field collected DDT resistant strain of rice weevil, Sitophilus zeamais.
    • Philippine Entomologist Volume 2, No. (5):
    • Rejesus, B.M. Flores, C.G., () Coffe berry borer attacks coffee plantation in Laguna and Batangas.
    • Agriculture at Los Ba?os Volume 13
    • Rejesus, B.M. Bernardo, E.N., (1973) Insecticide resistance of brown planthopper from Laguna.
    • Agriculture at Los Ba?os Volume 12
    • Rejesus, B.M., (1973) Metabolism of Mobam (4-Benzothinyl-N, methyl carbamate) in resistant and susceptible houseflies.
    • Pesticide Physiology and Biochemistry Volume 3
    • Rejesus, B.M. Adalla, C.B., (1974) Distribution of rice weevil complex (Sitophilus oryzae Linn, Zeamais Motsch.) in the Philippines.
    • Advances in Food, Agriculture and Community Research and Development.
    • Rejesus, B.M. Paguia, P., (1974) Effect of natural and synthetic juvenile hormones on corn borer.
    • Advances in Food, Agriculture and Community Research and Development
    • Rejesus, B.M., (1974) Evaluation of three granular systematic insecticides for the control of corn borer and corn earworm on corn,
    • Advances in Food, Agriculture, Forestry and Community Development, Part 1.
    • Rejesus, B.m. Martinez, L., (1974) Insecticide residues in stoned grains.
    • Advances in Food, Agriculture and Community Research and Development
    • Rejesus, B.M., (1974) Insecticides as protectants of shelled corn during storage.
    • Advances in Food, Agriculture and community Research and Development.
    • Rejesus, B.M, (1974) Joint toxic action of insecticides on DDT-resistant and susceptible rice weevils (Sitophilus zeamais Motshc.)
    • Advances in Food, Agriculture, Forestry and Community Research and Development (Part 2).
    • Rejesus, B.M., (1974) Mass rearing of diamond backmoth (Plutella xylostella Linn.) in synthetic diet and petsai leaves.
    • Advances in Food, Agriculture , Forestry and Community Research and Development. (Part 2)
    • Rejesus, B.M., (1974) Residual toxicity to rice weevil and the effect on germination of seven insecticides.
    • Advances in Food, Agriculture, Forestry, Community research and Development (Part 1)
    • Rejeus, B.M., (1974) Assistance to insecticdes of Philippine populations of rice weevil complex.
    • Advances in Food, Agriculture and Community Research and Development
    • Rejesus, B.M. Nerona, E., (1974) Storage of shelled corn in synthetic sacks treated with insecticides.
    • Advances in Food, Agriculture and Community Research and Development.(Part 2)
    • Rejesus, B.M., (1974) Studies on the synergism of insecticides.
    • Advances in Food, Agriculture, Forestry and Community Research and Development (part 2)
    • Rejeus, B.M., (1974) Survey of Philippine population of rice weevil complex (Sitophilus oryzae L. and Sitophilus zeamais Motsch) for resistance to insecticides.
    • Advances in Food, Agriculture, Forestry and Community Research and Development (Part 1)
    • Javier, P.A. Rejesus, B.M., (1975) Control of lanzonez bark borer Prasinoxena sp. (Lepidoptera: Galleriidae) with notes on its biology.
    • Philippine Entomologist Volume 3, No. (2):
    • Santhoy, O. Rejesus, B.M., () Development rate, body weight and reproductive capacity of Sitophilus zeamais (Motsch) reared on three natural hosts.
    • Philippine Entomologist Volume 2, No. (5):
    • Cariño, F.O. Rejesus, B.M., (1975) Evaluation of three insecticides as pre-harvest sprays and for sack treatment for the control of rice weevil Sitophilus zeamais in three recommended varieties of corn.
    • Proc., 6th Annual Conference, Upland Crops, College, Laguna
    • Rejesus, B.M. Varca, L.M. Nerona, E.N., (1975) Insecticide impregnation of sacks and use of plastic lining for the protection of stored corn against insect damage.
    • Philippine Agriculturist Volume 5-6, No. 59
    • Quebral, F.C. Mercado, B.L. Rejesus, B.M. Adalla, C.B., (1975) Pesticide Information Manual
    • College, Laguna: UPLB College of Agriculture
    • Rejesus, B.M., (1975) Residual toxicity of five insecticides in three varieties of corn.
    • Research Reports
    • Verbo, E.D. Rejesus, B.M., (1975) Residual toxicity of six insecticides to rice weevil and their effect on germination of corn.
    • Philipine Agriculturist Volume 59, No. (3-4):
    • Rejesus, B.M., (1975) Storage pests and their control.
    • Proc., Seminar in Food Storage and Handling Practices,Manila
    • Rejesus, B.M., (1975) Studies on the synergism of insecticides.I. Synergism of malathion, DDT, carbaryl and lindane by eight synergists on susceptible DDT and lindane resistant, rice weevils, Sitophilus zeamais Motsch.
    • NRCP Research Bulletin Volume 30, No. (2);
    • Rejesus, B.M., (1975) Studies on the synergism of insecticides II. Joint toxoc action of insecticides on DDT-resistant and susceptible rice weevil, Sitophilus zeamais Motsch,
    • NRCP Bulletin Volume 57
    • Huynh, H. Rejesus, B.M., (1975) Toxicity of carbofuran to the brown plahopper, Nilaparvata lugens (Stal) (Hemiptera: Delphacidae) and its metabolism in the rice plant.
    • Philippine Entomologist Volume 3, No. (2):
    • Rejesus, B.M., (1976) Bio-ecological and control studies on coffee berry borer, hypothenemus hampei (Ferr.) in the Philippines.
    • Research Reports
    • Rejesus, B.M., (1976) Comparative study of the lethal effects of natural and synthetic juvenile hormones on Ostrinia furnacalis Guenee andother insects.
    • NRCP Research Bulletin Volume 31, No. (1);
    • Cariño, F.O. Rejesus, B.M., (1976) Control of Sitophilus zeamais and Rhizopertha dominica pre-harvest sprays and sack treatment with three pre-harvest sprays and sack treatment with three insecticides in three sorghumvarieties.
    • Philippine Agriculturist Volume 60, No. (3-4):
    • Rejeus, B.M. Eroles, D.C., (1976) Direct grain treatment and sack impregnaion with insecticides to control corn storages pests.
    • Philippine Agriculturist Volume 59, No. (9-10)
    • Ramos, V. Rejesus, B. M., (1976) Effects of nutrition on larval coloration of Helicoverpa armigera (Hubn.).
    • Proc., 8th National Conference, Pest Control Council of the Philippines, Bacolod City
    • Adalla, C.B. Rejesus, B.M., (1989) The golden apple snail, Pomacea sp., a serious pest of the lowland rice in the Philippines.
    • In: (Henderson, I.,ed.) Slugs and Snails in World Agriculture, British Crop Protection Council, Monograph No. 41.
    • Rejesus, B.M. Sayaboc, A.S. Joshi, R.C., (1988) The distribution and control of the introduced garden snail (Pomacea sp.) in the Philippines.
    • Symposium on Introduction of Germplast and Plant Quarantine Procedures.
    • Rejesus, B.M., (1993) Botanical pesticides inintegrated pest manegment.
    • NRCP in its Diamond jubilee.
    • Rejesus, R.M. Decena, A., (1981) The insecticidal activity of marigold(Tagetes spp.) and makabuhai (Tinospora rumphii Boerlage)
    • NRCP Bulletin Volume 36(1)
    • Rejesus, B.M. Decena, A., (1983) The activity, isolation, purification and identification of the insecticidalproperties from Tagetes.
    • Philippine Journal of Crop Science Volume 7(1)
    • Rejesus, B.M., (1988a) Status and prospects of botanical pesticides in the Philippines.
    • @nd SEARCA Professorial Chair Lecture, Aug. 29, 1984, UPLB, College, Laguna
    • Rejesus, B.M., (1988) Field evaluation of makabuhai (Tinospora rumphii Boel.) against rice insect pests.
    • Int. Seminar on Under-Utilized Bioresources in the Tropics, No. 15-16, 1988
    • Rejesus, B.M., (2000) Selectivity of acephate and prophapos to the Wold spider Pardosa pseudoannulata (Boes et Strand)and brown planthopper Nilaparvata lugens (Stal.) Part II. Metabolism.
    • Philippine Agricultural Scientist Volume 83(3)
    • Rejesus, B.M. Javier, P.A. Bilog, J.P., (1992) Augmentative releases of the parasitoid, Aphytis lingnanensis Compere (hymenoptera: Aphelinidae) against California red scale and snow scale insects (Homoptera: Diaspididae) in citrus.
    • Philippine Journal of Crop Science Volume 17(2)
    • Morallo-Rejesus, B. Maini, H. Dayrit, F.B. Quintana, E., (1989) Insecticidal actions of Vitex negundo L.
    • Proc.,Ist Asian-Pacific Conference of Entomology, Nov. 18-13, 1989, Chiang Mai, Thailand
    • Morallo-Rejesus, B. Maini, H.A. Oshawa, K. Yamamoto, I., (1989) Insecticidal actions of several plants to Callosobruchus chinensis L.
    • Paper presented, 2nd Int. Symposium on Bruchids and Legumes.
    • Maini, P.N. Morallo-Rejesus, B., (1993) Molluscicidal activity of Derris elliptica (Fam.leguminosae)
    • The Philippine Journal of Science Volume 122(1)
    • Rejesus, B.M. Rejesus, R.S., (2001) Biology and management of stored products and postharvest insect pests.
    • PCARRD, ISBN 971-20-48005
    • Morallo-Rejesus, B., () Research advances and needs in the control of asiatic corn borer, Ostrinia furnacalis (Guenee), in the Philippines
    • Rejesus, B.M., (1984) Detasseling technique for the control of cornborer ,Ostrinia furnacalis (Guenee).
    • () The author has 76 titles of publications listed in Philippine Men of Science, Vol.IV, 1983, (1960-1982)

Awards:

    • Outstanding Book/Monograph Award, PCARRD-DOST, 2002
    • Achievement Award (Biological Sciences), NRCP-DOST, 1998