Journal of Plant Protection

Parasitism and reproductive ability of Trichospilus pupivorus (Hymenoptera: Eulophidae) on greater wax moth Galleria mellonella (Lepidoptera: Pyralidae) pupae

2026-03-09T16:24:39+07:00

Trichospilus pupivorus is an endoparasite of many insect pests of tropical and subtropical regions. In the

Mekong Delta, they are identified as important agents in the management of the coconut black-headed caterpillar

O. arenosella. This study was conducted to determine the parasitic effectiveness of T. pupivorus wasps on the

host Galleria mellonella pupae. Experiments were carried out including rearing T. pupivorus populations and

individuals on different numbers of hosts. The results showed that when rearing T. pupivorus populations on G.

mellonella pupae, the rate of wax worm pupae in the treatments carrying was 100%. The time for the wasps to

parasitize the host was mainly from 01 to 04 days. The average number of T. pupivorus wasps in the 01 mummy

with 20, 25 and 30 wax moth pupae giving high results was 11,313±2,128, 10,929±922 and 10,964±1,551,

respectively. The proportion of adult T. pupivorus females in all treatments was from 95.2 - 95.9%. When

breeding individuals, signs of parasitism were detected from the 2nd day after exposure to an average of

1.00±0.00 to 1.33±0.58 wax moth pupae carrying T. pupivorus. The rearing density of 1 adult female T. pupivorus

with 5, 10 and 15 wax moth pupae resulted in emergence of 188.3±21.5, 134.3±74.5 and 127.0±21.9 individuals,

respectively. The total time from exposure to emergence was 16.0 days and T. pupivorus had a longer survival

time of female adults than male adults in all experiments.

Molecular and biological characteristics of the aphid Pentalonia nigronervosa (Hemiptera: Aphididae) damage on banana plants in Viet Nam

2026-03-09T16:55:18+07:00

Banana plants (Musa sp.) are tropical fruit crops widely cultivated in many countries, including Vietnam. The

banana aphid Pentalonia nigronervosa is one of the most important insect pests of banana due to both direct

feeding damage and its role as a vector of Banana bunchy top virus (BBTV). This study investigated the

molecular identification and biological characteristics of P. nigronervosa on banana plants in Hanoi. DNA

barcoding based on the mitochondrial COI gene confirmed that species of aphids collected from banana plants in

Hanoi was P. nigronervosa (Aphididae, Hemiptera). At 25°C, the aphid life cycle was shortest when reared on

Cavendish banana and Royal banana (13.03 and 13.39 days), followed by Tay banana (14.38 days), and

galangal (15.89 days), respectively. Female fecundity was highest on Cavendish banana (22.44 aphids/female),

followed by Royal banana (19.58 aphids/female), Tay banana (15.50 aphids/female) and galangal (11.32

aphid/female). The survival rate of P. nigronervosa was highest (84.7%) when being reared on Cavendish

banana, whereas complete mortality (100%) was observed on ginger plants. These results show that banana

plants are more suitable plant hosts for P. nigronervosa than that of ginger or galangal plants

Identification of the causal agent of gummosis stem rot disease on Jackfruit (Artocarpus heterophyllus) in Can Tho City, Viet Nam

2026-03-09T17:02:20+07:00

Based on the results of surveys conducted in jackfruit orchards, sample collection, and isolation of bacteria from

typical infected specimens over a two-year period in Hau Giang (formerly, now Can Tho City), as well as artificial

inoculation results on 3-4-year-old jackfruit trunks, the bacterium Pectobacterium aroidearum has been identified as the

causal agent of stem rot and gummosis in jackfruit trees. Symptoms appear year-round but develop rapidly during the

rainy season, with a damage rate reaching up to 50.93%. The disease is most severe in August and September, with

infection rates in orchards ranging from 66.67% to 73.33%. Pectobacterium aroidearum is motile, unable to grow in a

5% NaCl environment, and tests negative for both nitrate reduction and catalase reactions.

Research on the inhibitive ability Aspergillus niger causing collar rot disease in groundnut of some nano preparations

2026-03-09T17:06:08+07:00

Collar rot is a devastating disease caused by the soil-borne pathogen Aspergillus niger, which significantly

impacts groundnut production worldwide. The long-term persistence of this fungus in the soil can diminish the

effectiveness of synthetic fungicides. In this study, a compound made of Chitosan oligosaccharide 1000 ppm

(COS 1000 ppm) combined with Silver nanoparticles 50 ppm (AgNPs 50 ppm) and Copper ions 500 ppm (Cu2+

500 ppm) was tested for its antifungal activity against A. niger. The results showed that concentrations of the

AgNPs, Cu2+/COS nanoparticles compound ranging from 1 to 5% effectively inhibited the growth of A. niger in invitro conditions, achieving complete inhibition (100%). Additionally, in net-house conditions, applying the AgNPs,

Cu2+/COS nanoparticles at a concentration of 1% either one time (one day before inoculation) or two times (one

day before and one day after inoculation) reduced the disease rate from 100% to between 0% and 4.44%

compared to the control group. Therefore, AgNPs, Cu2+/COS nanoparticles appear to be a promising high-tech,

safe, and effective solution for preventing collar rot disease in groundnut caused by the fungus A. niger

Preliminary study results on the fruit drop syndrom on the Xuan Van persimmon trees in Tuyen Quang province

2026-03-09T17:09:58+07:00

The fruit drop syndromon of persimmon trees in Xuanvan, Tuyenquang province, has become increasingly

serious in most orchards. Fruit drop occurs at two peaks, the first at the beginning of the season - along with

physiological fruit drop, and the second at the end of the season - about one month before harvesting. The

causative agent has been identified as the fungus Diaporthe sp. based on the combination of the morphological

and molecular characteristics. In vitro, the optimal conditions for the growth of Diaporthe sp. were on PDA

medium at a range of 25 oC - 30oC and pH 5,0 – 7,0. Proactively apply a double sprays of chemical fungicides

containing active ingredient Azoxystrobin of 7 days interval when the leaves of spring shoots reach about

maximum size can effectively to prevent fruit drop on Xuanvan persimmon trees.

Efficacy of nanocompounds against Pyricularia oryzae causing rice blast disease under in vitro conditions

2026-03-09T17:16:15+07:00

The study was conducted to assess the ability of nano-formulated compounds to directly inhibit mycelial

growth and conidial formation of Pyricularia oryzae, the causal agent of rice blast disease. The findings indicated

that zinc-based nanocomposites combined with aqueous extracts of Annona glabra (0.024%), of Impatiens

balsamina (0.024%), and of Catharanthus roseus (0.024%), as well as nano chitosan–SA formulations at

concentrations of 0.006%, 0.013%, and 0.027% incorporated into PDA medium, all exhibited direct inhibitory

effects on the pathogen growth under in vitro conditions. Among the treatments, nano chitosan–SA at 0.027%

demonstrated the highest suppression of colony development, reaching 17.58% at 12 days after putting fungal

slices. This formulation also strongly inhibited conidial formation, achieving 62.60% suppression at 22 days after

fungal slices, highlighting its potential for application in rice blast management.