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Catture massali di Ips typographus (Coleoptera Scolytidae) con trappole e alberi esca, e loro efficacia nella limitazione dei danni.
No full textIps typographus (L.) (Coleoptera Scolytidae) in Southeastern Alps: Results of a Six-Year-Long Monitoring Program
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Ips typographus (L.) pheromone trapping in south Alps: spring catches determine damage thresholds
No full textIps typographus is one of the major forest pests in the Italian Alps. From 1996, populations of I. typographus in Friuli-Venezia Giulia region (NE Italy) have been permanently monitored in areas of outbreak by using pheromone traps. At the same time, damage caused by the insect was estimated annually. Preliminary analysis of the data (1996-2002) reveals some interesting information: (i) the flight activity of I. typographus is very extended and occurs over a period of about 4 months (May to August); (ii) there is a high correlation between mean captures per trap and annual damage; (iii) there is a high correlation between spring captures (May to mid-June) and total captures (May to August), and between spring captures (May to mid-June) and annual damage. The correlation between spring captures and damage allows the determination of a reliable risk-damage threshold (about 5000 beetles/trap, in spring), reducing at the same time, the monitoring period and the general costs
Can pheromone trapping predicts Ips typographus outbreaks? An example from South-Eastern Alps
No full textA practical method for predicting the short-time trend of bivoltine populations of Ips typographus (L.) (Col., Scolytidae)
No full textIps typographus is the main spruce pest of European forests. In most areas of the Italian Alps there are two generations per year; overwintering adults fly in May looking for trees suitable for breeding, their offspring emerge in summer, 7-8 weeks after tree colonization, and the adults of the second generation emerge in spring of the following year after overwintering under the bark or in the litter. A long-term population monitoring was carried out in north-east Italy with the aim at developing a prediction model able to estimate the population density of the following year. Between 1996 and 2004, pheromone traps monitored populations of I. typographus annually. Monitoring lasted 4 months (May-August), with replacement of pheromone dispensers after 8 weeks. Insects trapped before dispenser change were called 'spring captures' (May-June), and included both overwintering and re-emerging adults. Beetles caught after dispenser change were called 'summer captures' (July-August), and inclu..
Can pheromone trapping predict Ips typographus outbreaks? An example from South-Eastern Alps.
No full textDamage reduction and performance of mass trapping devices for forest protection against the spruce bark beetle, Ips typographus (Coleoptera Curculionidae Scolytinae)
No full text The spruce bark beetle, Ips typographus, is one of the main European
forest pests, and mass trapping is probably the most common strategy applied
to reduce its population density. However, the results concerning the
effectiveness of this control system are often controversal, and many
studies consider only the trapping performance with no attention to the
damage reduction. During spring-summer 2005, a control program against I. typographus
outbreaks was set up in NE Italy. Twenty-four spruce forests heavily
infested by I. typographus were studied: six protected by pheromone
slot-traps, six by horizontal trap-logs and six by standing trap-logs; six
untreated stands were kept as controls. Trap-logs were baited with a
pheromone specific to I. typographus and treated with insecticide. Each type
of device was tested at high, medium and low density in relation to the
number of trees infested during the previous year. New damage occurring in
the investigated stands was later monitored for one year. Protected forests showed mean damage about 80% lower in 2005 than in
2004, with no statistical difference among traps, trap-logs or standing
trap-logs. Instead, unprotected forests (controls) suffered damage to a
similar extent in both years. Trapping devices showed no statistical
differences among mean captures. Device densities showed similar results in
damage reduction and insect trapping. The results support the hypothesis that intensive trapping performed at
stand level may be useful for protecting forests against I. typographus,
locally reducing population density and tree mortality.Réduction des dégâts et efficacité des dispositifs de
piégeage de masse pour la protection des forêts contre le
typographe, Ips typographus (Coleoptera Curculionidae Scolytinae). Le coléoptère scolytide, Ips typographus, est l'un des principaux ravageurs des forêts européennes d'épicéa, et le piégeage
phéromonal est probablement le procédé de lutte le plus
utilisé pour réduire la densité de ses populations. Cependant,
l'efficacité de ce système de contrôle n'est souvent pas
très claire, et beaucoup d'études considèrent seulement les
performances du piégeage et non la réduction des dégâts. En 2005, un programme de lutte contre I. typographus a été appliqué dans le Nord-Ouest de l'Italie. Une étude a été conduite dans 24
forêts d'épicéa lourdement infestées par le typographe: six
protégées par pièges à phéromones, six par
arbres-pièges abattus, six par arbres-pièges sur pied, et six
laissées sans protection (témoins). Les arbres-pièges ont
été appâtés avec une phéromone spécifique d' I. typographus et
traités avec un insecticide. Chaque type de dispositif a été
testé à haute, moyenne et basse densité en se basant sur le
nombre d'arbres infestés l'année précédente. Les
dégâts nouveaux causés par le typographe ont été suivis
pendant un an. En 2005, toutes les forêts protégées ont montré un niveau
moyen de dégâts d'environ 80 % inférieur à celui de 2004,
sans différence significative entre les dispositifs, alors que les
forêts témoins ont souffert de dégâts similaires les deux
années. Le nombre moyen de captures ne différait pas
significativement entre les dispositifs de piégeage. La diminution des
dégâts et du nombre d'insectes piégés a été
comparable à toutes les densités de traitement. Ces résultats confortent l'hypothèse selon laquelle le
piégeage de masse au niveau du peuplement peut être utile pour la
protection des forêts contre le typographe, en diminuant la densité
de population du ravageur et ses dégâts
Impiego di sistemi informativi territoriali (GIS) nella valutazione del rischio di attacco di Ips typographus.
No full textIndirizzi selvicolturali per il contenimento dei danni da bostrico nelle foreste delle Alpi orientali
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