• Korean journal of applied entomology
• /
• v.38 no.2
• /
• pp.81-84
• /
• 1999

A linden leaf-mining sawfly, Parna kamijoi Togashi, 1980, is newly reported from Korea. A brief description of the adult and adult and observations on its life history are given.

• Journal of Korean Society of Forest Science
• /
• v.83 no.4
• /
• pp.450-459
• /
• 1994

The damage by the black-tipped sawfly, Acantholyda posticalis posticalis Matsumura, has been increasing at several locations in central part of the Korean peninsula. This study was undertaken at selected plots in Kapyung-gun, Kyunggi Province and Hongchon-gun, Kangwon Province from 1984 to 1987. The purpose of this study was to provide basic information for integrated control of this pest and to determine the economic threshold by investigating the pest host interactions with special reference to damage analysis. The results obtained were as follows ; 1. The damage was more severe at upper part than at lower part of the crown. The vertical distribution of dry weight of damaged trees above ground showed L-type distribution, whereas that of healthy trees showed C-type distribution. 2. The needle loss by sawfly reduced both of height and the diameter growth of the main stem. The growth reduction occurs when the needle loss is 50% or higher. About 10% of tree growth was reduced at 50% of needle loss. 3. The reduction of diameter growth was more severe at upper part than at lower part of the main stem. 4. Volume growth was reduced when more than 50% of the needles were damaged after three years of the sawfly infestation. Reductions of total volume increment at the levels 70% and 90% of needle damage were 9% and 20%, respectively.

• Korean journal of applied entomology
• /
• v.62 no.3
• /
• pp.125-129
• /
• 2023

We report the unrecorded genus and species, Notopygus emarginatus Holmgren, 1857, for the first time from South Korea. The genus Notopygus is a parasitoid wasp of Pamphiliidae (sawfly) that can be distinguished by the posterior margin of metasomal tergite eight, which frequently project strongly upwards. In the study, we provide a description and photographs of newly recorded species.

• Korean journal of applied entomology
• /
• v.7
• /
• pp.53-55
• /
• 1969

At Nowan Myun and Bia Myun of Cholla-namdo the pear stem sawflies were found as the most serious pests of the pear trees. The writer attempted to control the pear stem sawfly by spraying certain insecieides in 1968. 1) The significance of each chemical applicated turned out to be as shown in Table 2 and 3. The priority of effectiveness among the chemicals turned out to be as follows: Dimecron>Lebaycid>D. S. >Endrin>Metasystox>DDVP 2) It was also found that the significance vary according to the difference in time of application of the insecticides as shown in Table 2 and 3. Dimecron and Lebaycid were found to be most effective at the hatching day and the 4th day after the hatching.

• Korean journal of applied entomology
• /
• v.59 no.4
• /
• pp.443-449
• /
• 2020

This study described and illustrated the morphology of the sawfly's larva Monocellicampa pruni Wei, 1998 for the first time. Our observations confirmed that its larval biology associated with Japanese plum Prunus salicina Lindl included five instars. The larvae of M. pruni are allied to the general morphology of subfamily Nematinae with a cylindrical body, globose head, 4-segmented antenna, thoracic legs with a distinct claw, and 5 dorsal annulets on abdominal segments I - VIII. The absence of anal prolegs after the first molting shows a distinction with the larvae of genus Hoplocampa.

• Journal of Korean Society of Forest Science
• /
• v.89 no.5
• /
• pp.630-633
• /
• 2000

The damage by the black-tipped sawfly, Acantholyda posticalis posticalis, has been increasing all over the area of Korean pine(Pinus koraiensis)stands in Korean peninsula. This study was conducted to provide basic information for the management and control of this pest by investigating the feeding quantity of pine needles during the larval stage. The results were summarized as follows : The total needles damaged in the larval stage of the black-tipped sawfly were 9,584mm in length on an average and those of female and male were 11,774mm and 7,394mm, respectively. The total length ingested actually was 7,797mm and it was equivalent to 81.4% of the total length damaged. Early larval stage showed a little feeding and it was equivalent to 17% of total quantity. On the contrary, the feeding quantity in late larval stages of fourth and fifth instars amounted to 83%. The number of the frass excreted per larva was about 1,160, and the difference between male and female was not showed, whereas it showed remarkable difference among larval instars.

• Journal of Korean Society of Forest Science
• /
• v.96 no.1
• /
• pp.1-6
• /
• 2007

Entomopathogenic nematodes (Heterorhabditis sp. Gyeongsan strain, Steinernema carpocapsae GSN1 strain, S. feltiae Monteri strain, S. glaseri Dongrae strain, S. longicaudum Nonsan strain and S. monticolum Jiri strain) were evaluated for the environmentally sound control of sawfly, Arge captiva, A. pagana pagana and A. similis in the laboratory and pot. The corrected mortality of 3rd instar of Arge captiva larva was 100% at 5 days after treatment with S. carpocapsae GSN1 strain and S. feltiae Monteri strain in Petri dish. The mean numbers of established infective juveniles (Ijs) of S. glaseri Dongrae and S. carpocapsae GSN1 strain in a Arge captiva larva were 10.2 and 4.2 Ijs/larva, respectively. Pathogenicity of S. carpocapsae GSN1 strain was different larval stage, i.e., $LC_{50}$ value of S. carpocapsae GSN1 strain against 2nd, 3rd and 4th instar of A. pagana pagana was 11.5, 9.3, and 8.4 Ijs, respectively. Mortality of Arge captiva, A. pagana pagana and A. similis were 72.5, 85.0 and 85.0% by S. carpocapsae GSN1 strain at the $2{\times}10^9Ijs/ha$, respectively, in the pot.

• Journal of Korean Society of Forest Science
• /
• v.83 no.4
• /
• pp.498-504
• /
• 1994

The damage by the black-tipped sawfly, Acantholyda posticalis posticalis Matsumura, has been incheasing at several locations in central part of the Korean peninsula. This study was undertaken at selected plots in locality of Kapyung-gun. Kyunggi Province from 1984 through 1987. The purpose of this study was to provide basic information for integrated control of this pest and to determine the economic threshold by investigating the pest-host interactions with special reference to damage analysis. The results obtained were as follows ; 1. One year old cone formation began to be reduced when 30-40% of the needles were destroyed. With 70% of defoliation, few cones were produced. 2. Number of two year old cone formation and amount of cones began to be reduced when 61-70% of the needles were destroyed ; economic threshold of the defoliation rate retarding the seed production was 51%. 3. Growth of the trees was significantly reduced when more than 50% of the needles were destroyed, and cone production began to be retarded at 30-40% of defoliation. Therefore, it was determined that the economic thresholds requiring the control practices to keep normal tree growth and cone production from being reduced were 50% and 30%, respectively.

• Korean journal of applied entomology
• /
• v.60 no.4
• /
• pp.479-487
• /
• 2021

This study investigated the life history of the plum sawfly Monocellicampa pruni Wei, 1998 through field observations and laboratory experiments. M. pruni is a univoltine, complete metamorphosis species with five instars at the larval stage. Adults emerge from the soil around mid-March when Japanese plum trees are in their flowering period. The adults deposit one (rarely two) egg(s) under the epidermis layer of the calyx. After hatching, the larva soon burrows into the fruitlet, consumes the endocarp and remains inside the fruit within its four-time moulting transitions before reaching full growth. At maturity (in May), the larva leaves the infested fruitlet through an exit hole and burrows into the soil at a depth of 2 - 11 cm for spinning its cocoon and hibernates until the next spring as the larval form. Under laboratory conditions (T = 20℃; RH = 40 - 60%), the male lived for a slightly shorter period than the female, 6.03 ± 0.40 and 7.55 ± 0.45 days, respectively. A female could produce 30.29 ± 4.50 eggs in her lifespan. In the field, the duration of the egg was approximately 10 - 11 days and that of the larva was approximately 31 - 34 days.

• Korean journal of applied entomology
• /
• v.14 no.4 s.25
• /
• pp.215-219
• /
• 1975

The number of instars of pear sawfly larvae (Janus piri Okamoto) collected front field pear trees, were determined by measuring the width of head capsule, and the growth ratio in each instar was also studied. 1. The larval head width had six distinct peaks, which suggests that the larva of this insect passes six instars. 2. The head width tended to increase as the instars avdance, except in tile first and second instars. The coeffieient of variation decressed as the instars advanced. The growth ratio, which was similarly great in the first and second instars, decreased as the instars advanced. 3. Gains' and Campbell's formulae seemed to be more suitable than Dyer's for the determination of larval instars of this insect by the measurement of headwidth. 4. The larval instars could be inferred from the extent of damage to pear tree by this insect; that is the larvae in the second to fourth instars usually gave slight and invissible damage, while those in the fifth to sixth instars gave rapid and severe damage.