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Articles 1 - 10 of 10
Full-Text Articles in Life Sciences
Feeding Behavior Of Sweet Potato Weevil, Cylas Formicarius (Fabricius) (Coleoptera: Brentidae) On Three Sweet Potato, Ipomoea Batatas L. Cultivars Grown In Tarlac, Philippines, Jerah Mystica Novenario, Flor Ceballo-Alcantara
Feeding Behavior Of Sweet Potato Weevil, Cylas Formicarius (Fabricius) (Coleoptera: Brentidae) On Three Sweet Potato, Ipomoea Batatas L. Cultivars Grown In Tarlac, Philippines, Jerah Mystica Novenario, Flor Ceballo-Alcantara
The Philippine Agricultural Scientist
Sweet potato is grown in tropical countries for its edible tubers, which have become an essential food source. It is usually propagated through vine-cutting, which can be obtained from harvested plants or nurseries intended for cutting production only. The recurrent use of vines may cause increased weevil infestation. The crop is known to be infested with insect pests. More importantly, the sweet potato weevil, Cylas formicarius, targets the tubers, thus, causing the economic losses. Sweet potato farmers in Tarlac claim that only one sweet potato cultivar is being attacked by C. formicarius, however, it was found in this experiment that …
Taxonomy Of Cassava (Manihot Esculenta Crantz) Mealybugs (Hemiptera: Pseudococcidae) - 1: Identification And Local Distribution Of The Predominant Species On Witches’ Broom-Diseased Plants In The Philippines, Ireneo L. Lit Jr., Cristian Lucañas, Joanne Langres, Lolita Dolores, Ruby Ana Laude, Merdelyn Caasi-Lit
Taxonomy Of Cassava (Manihot Esculenta Crantz) Mealybugs (Hemiptera: Pseudococcidae) - 1: Identification And Local Distribution Of The Predominant Species On Witches’ Broom-Diseased Plants In The Philippines, Ireneo L. Lit Jr., Cristian Lucañas, Joanne Langres, Lolita Dolores, Ruby Ana Laude, Merdelyn Caasi-Lit
The Philippine Agricultural Scientist
Samples of cassava (Manihot esculenta Crantz) plants infected with witches’ broom disease were gathered from 13 provinces in the Philippines. Mealybugs were observed to occur in nine out of the 13 cumulative samples. The most predominant among several mealybug species observed was identified as Pseudococcus jackbeardsleyi Gimpel and Miller. P. jackbeardsleyi is not yet known to transmit phytoplasma, especially the one causing cassava witches’ broom (CWB). However, its occurrence in almost 70% of the CWB-infected samples provides circumstantial evidence that it may be related to the spread of the pathogen. This formal report of identification is in support of the …
Biology Of Spodoptera Frugiperda (J.E. Smith) (Lepidoptera: Noctuidae) On Rice And Different Corn Varieties, Anthony S. Agravante, Karen B. Alviar, Analiza Henedina M. Ramirez, Sheryl A. Yap
Biology Of Spodoptera Frugiperda (J.E. Smith) (Lepidoptera: Noctuidae) On Rice And Different Corn Varieties, Anthony S. Agravante, Karen B. Alviar, Analiza Henedina M. Ramirez, Sheryl A. Yap
The Philippine Agricultural Scientist
Rice and corn are one of the most important crops in the Philippines. Several insect pests contribute to the losses and low yield of these crops. The fall armyworm (FAW), Spodoptera frugiperda (J.E. Smith), was recently reported to cause economic damage to corn. Also, this insect consists of two genetically differentiated strains namely, the corn strain and the rice strain. This study was conducted in a laboratory conditions to evaluate the biological parameters of FAW on rice and corn varieties. Newly hatched larvae were fed such as the open pollinated variety (OPV), traditional variety, Macho F1 (hybrid), NK 6410 (genetically …
Susceptibility Of Pre-Adult Biological Stages Of Mythimna Separata (Walker) (Lepidoptera: Noctuidae) To Three Entomopathogenic Fungi (Hypocreales), Melissa P. Montecalvo, Marcela M. Navasero
Susceptibility Of Pre-Adult Biological Stages Of Mythimna Separata (Walker) (Lepidoptera: Noctuidae) To Three Entomopathogenic Fungi (Hypocreales), Melissa P. Montecalvo, Marcela M. Navasero
The Philippine Agricultural Scientist
Armyworms are polyphagous insect pests of agricultural crops. Their population is usually managed below threshold level using insecticides. However, a single control measure is insufficient to attain a sustainable pest management. Hence, this research was conducted to assess the three species of entomopathogenic fungi as potential biological control agents against Mythimna separata (Walker) or paddy armyworm. Dose mortality assays were conducted to determine the pathogenicity of Beauveria bassiana (Bals.) Vuill., Metarhizium anisopliae (Metschn.) Sorokin, and Metarhizium rileyi (Farlow) Kepler, S.A. Rehner and Humber against various biological stages of M. separata including egg, 1st to 6th larval instars, prepupa, …
Rheological Properties And Postharvest Behavior Of Onion (Allium Cepa L. 'Superex') Subjected To Different Preharvest Treatments To Control Armyworm [Spodoptera Exigua (Hubner Lepidoptera: Noctuidae], Daphne Cassandra Gonzales, Ryan Anthony Lualhati, Kim John Nate, Cielo Azul Dumlao, Emmanuel Amatorio, Elda Esguerra, Bonifacio Cayabyab
Rheological Properties And Postharvest Behavior Of Onion (Allium Cepa L. 'Superex') Subjected To Different Preharvest Treatments To Control Armyworm [Spodoptera Exigua (Hubner Lepidoptera: Noctuidae], Daphne Cassandra Gonzales, Ryan Anthony Lualhati, Kim John Nate, Cielo Azul Dumlao, Emmanuel Amatorio, Elda Esguerra, Bonifacio Cayabyab
The Philippine Agricultural Scientist
Heavy reliance on synthetic pesticides has led to insecticide resistance of pests such as the onion armyworm, leading to the use of alternative strategies such as biopesticides. While studies on the efficacy of these biopesticides on pest control and yield exist, their subsequent effects on the quality and postharvest behavior of bulb onions during cold storage need to be determined. Allium cepa L. ‘Superex’ yellow type onion plants were subjected to preharvest treatments of microbial (NPV crude), botanical (neem oil), synthetic insecticide (chlorfenapyr), and Farmer’s Practice (control) for the control of onion armyworm (Spodoptera exigua (Hubner)). Bulbs were then …
Mixed Infections Of Ca. Liberibacter Asiaticus And Citrus Tristeza Virus Affecting Calamansi (Citrofortunella Microcarpa Bunge) In Oriental Mindoro, Philippines [Research Note], Alliah Czarielle Mañugo, Julie Ann Mae Bolo, Julianne Camacho, Jamil De Guzman, Edna Aguilar, Filomena Sta Cruz
Mixed Infections Of Ca. Liberibacter Asiaticus And Citrus Tristeza Virus Affecting Calamansi (Citrofortunella Microcarpa Bunge) In Oriental Mindoro, Philippines [Research Note], Alliah Czarielle Mañugo, Julie Ann Mae Bolo, Julianne Camacho, Jamil De Guzman, Edna Aguilar, Filomena Sta Cruz
The Philippine Agricultural Scientist
Huanglongbing (HLB) and tristeza are the most destructive diseases affecting citrus crops worldwide, including calamansi (Citrofortunella microcarpa Bunge Wijnands) in the Philippines. Oriental Mindoro is the largest calamansi-producing province contributing to about 33% of the country’s production. This study was conducted to determine the current status of the occurrence of HLB and tristeza diseases affecting calamansi in the province through visual observation of symptoms in field surveys and detection of the causal pathogen. Both HLB and tristeza were found in all the nine villages surveyed located in the municipalities of Naujan, Pola, Roxas, and Victoria. Plants were showing the …
Identity And Population Density Of Thrips Hawaiiensis (Insecta: Thysanoptera) In Conventional “Magallanes” Pummelo Orchard In Carmen, Davao Del Norte, Philippines, Roderick Granada, Flor Ceballo, Pio Javier
Identity And Population Density Of Thrips Hawaiiensis (Insecta: Thysanoptera) In Conventional “Magallanes” Pummelo Orchard In Carmen, Davao Del Norte, Philippines, Roderick Granada, Flor Ceballo, Pio Javier
The Philippine Agricultural Scientist
A conventional “Magallanes” Pummelo orchard in Brgy. Minda, Carmen, Davao del Norte, Philippines was selected to assess thrips species composition, population density, and associated natural enemies. The insecticide treated pummelo orchard was situated adjacent to vast Cavendish banana plantations. Thrips were collected weekly from September 2017 to July 2018 from five different randomly selected flowering pummelo trees by destructive sampling and yellow sticky trap methods. Thrips were sorted and examined under the microscope. Findings of the study showed that Thrips hawaiiensis (Morgan), (Thripidae: Thripinae) was the only species of thrips infesting “Magallanes” pummelo. This constitutes the first report in this …
Efficacy Study Of Selected Maize (Zea Mays L.) Genotypes Against The Asian Corn Borer, Ostrinia Furnacalis (Guenée), Yoryncita Marfori, Merdelyn Caasi-Lit, Tonette Laude
Efficacy Study Of Selected Maize (Zea Mays L.) Genotypes Against The Asian Corn Borer, Ostrinia Furnacalis (Guenée), Yoryncita Marfori, Merdelyn Caasi-Lit, Tonette Laude
The Philippine Agricultural Scientist
Laboratory and screen house studies were conducted to assess the efficacy of selected twenty-six maize varieties against Asian corn borer (ACB), Ostrinia furnacalis (Guenée). Hierarchical tree based on resistance parameters clearly revealed that the twenty-six maize varieties are best classified into three groups, viz. resistant, intermediate, and susceptible. In laboratory test, the varieties RCS2, RCS4, RCS5, 'IPB Var13', Bt2, Bt3, and Bt4 were consistently identified as highly resistant. Further examinations in stalk feeding assay showed that the resistant varieties had sharp decline in larval survival (LS) on the 2nd to the 5th day of larval feeding in …
First Report Of The Lanzones Scale Insect, Unaspis Mabilis Lit & Barbecho (Hemiptera: Diaspididae), Infesting Cacao, Theobroma Cacao L. [Research Note], Ireneo L. Lit Jr., Barbara L. Caoili, Merdelyn T. Caasi-Lit, Cristian C. Lucanas, Kristine O. Abenis, Vanessa Kate I. Alvarez, Romnick A. Latina
First Report Of The Lanzones Scale Insect, Unaspis Mabilis Lit & Barbecho (Hemiptera: Diaspididae), Infesting Cacao, Theobroma Cacao L. [Research Note], Ireneo L. Lit Jr., Barbara L. Caoili, Merdelyn T. Caasi-Lit, Cristian C. Lucanas, Kristine O. Abenis, Vanessa Kate I. Alvarez, Romnick A. Latina
The Philippine Agricultural Scientist
The lanzones scale insect, Unaspis mabilis Lit & Barbecho (Hemiptera: Diaspididae), is reported to infest cacao trees (Theobroma cacao) in Brgy. Nalook, Kalibo, Aklan. Despite minor morphological differences, analysis of DNA barcode region of the cytochrome c oxidase subunit I (COI) generated from the cacao-infesting scale insects (GenBank Accession Number MN114100.1) matched the DNA barcodes obtained from a complementary study (GenBank Accession Number MN114099), and hence, supported the species identity based on morphological characters. Notes on the distribution, host plant association and insights on possible control measures were provided.
Maximum Entropy (Maxent) Modeling Of The Potential Distribution Of Aspidiotus Rigidus Reyne (Hemiptera: Diaspididae) In The Philippines, Ireneo B. Pangga, Sheryl A. Yap, Arnold R. Salvacion
Maximum Entropy (Maxent) Modeling Of The Potential Distribution Of Aspidiotus Rigidus Reyne (Hemiptera: Diaspididae) In The Philippines, Ireneo B. Pangga, Sheryl A. Yap, Arnold R. Salvacion
The Philippine Agricultural Scientist
The coconut scale insect (CSI) Aspidiotus rigidus Reyne (Hemiptera: Diaspididae) poses a significant threat to coconut production in the Philippines as shown by recent outbreaks. Ecological niche modeling using Maximum Entropy (MaxEnt) was used to determine the effects of environmental factors on the infestation of A. rigidus, and map its potential distribution in the Philippines to assess the risk of future outbreaks. The influence of bioclimatic variables on A. rigidus infestation was determined using MaxEnt modeling using the location data of A. rigidus occurrence confirmed using molecular markers. Rainfall and temperature variables were important for A. rigidus distribution with …