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Application of Mating Disruption Approach to Control Codling Moth (Cydia pomonella L.) Damage to Apple Crops in Azad Kashmir, Pakistan



M. Ashraf, M. Asif, M. Adrees, Wajahat Hanif and CH. Muhammad Ishtiaq
 
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ABSTRACT

Various techniques are applied to control the pest damage to (pome) crops in different countries of the world. Among the integrated pest management programmes (IPCP), mating disruption (MD) approach has its own advantages over pesticide techniques being less hazardous to environment. An exhaustive systematic field trial surveys were conducted to explore the seasonal activities of Codling Moth (CM) Cydia pomonella under natural conditions and the (MD) method was applied to Control Maling Disruption (CM) damage to apple (pome) crops in area of Azad Jammu and Kashmir, (Pakistan). Mating Disruption (MD) technique offers several advantages over pesticide sprays methods and, MD reduces CM damage. The present study describes the assessment of time of pest infestation, peak flight temporal and spatial variation of CM (Cydia pomonella) in two different experimented habitats by the use of pheromone trap approach. For experimental data, two distinct flight periods of CM were recorded, suggesting two generations per year. The pest population density was observed to be the highest in the first weeks of May and July. It was concluded that by application of the MD technique a better growth of pome crops can be obtained. Hence, for sustainable and comprehensive fruit farming, a more widespread use of pheromones technique (Mating Disruption- MD) may be useful step to enhance the agricultural yield of apple (pome) crops

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  How to cite this article:

M. Ashraf, M. Asif, M. Adrees, Wajahat Hanif and CH. Muhammad Ishtiaq, 2007. Application of Mating Disruption Approach to Control Codling Moth (Cydia pomonella L.) Damage to Apple Crops in Azad Kashmir, Pakistan. Pakistan Journal of Biological Sciences, 10: 1728-1732.

DOI: 10.3923/pjbs.2007.1728.1732

URL: https://scialert.net/abstract/?doi=pjbs.2007.1728.1732

INTRODUCTION

Fruit crops (Pome family) play vital and an important role in human health and economics. Apple (Pome family) fruits have significant importance in human daily life and usually it is an essential part of desserts on the tables. But these cash crops are confronted with risks of different types of pests. Among these, Codling Moth (CM) Cydia pomonella L. is a key pest of European apple, Asian pear and Persian walnut (Barnes et al., 1992). This CM has world-wide ecological close association with the cultivation of apple, pear and walnut (Shel'deshova 1967). This pest is generally recorded in all apple growing countries. Its infestation ratio ranges between 20-95% apple crops (Gordon, 1980; Metcalf and Luckmann, 1982; Flint, 1995).

Among pome fruits, apple is one of the most leading crops which contributes 4% towards gross income of the Azad Kashmir (Pakistan). This state has ideal climatic conditions for apple production (Gardesi and Manzoor-ul-Haq, 1985). The apple growing areas are located ca. 1500-2000 m above sea level (Farooq Ahmad et al., 1999). More than 80% apple growing areas are rain fed and extreme cold winter season with an annual precipitation is 750-1600 mm. Apple (pome) trees are infested by a large and diverse number of phytophagous and entomophagous arthropod fauna. More than 500 insects were reported which feed on apple crops worldwide (Metcalf and Luckmann, 1982). Among the most common pest species include; Codling moth, (Cydia pomonella) Sanjose scale (Quadraspiditus pernicious), Spider mite (T. urtiale), red spider mite (Panonychus ulmi), Apple wooly aphid Erosoan langerum) and muscle scale (Lepious ulmil), cause major loss of apple fruit (Gonzalez, 1984; Gergely, 1994).

Several methodologies are being applied as an Integrated Pest Management Programme (IPMP) to obstacle the pest (insects) damage to the cash crops. Among commonly applied strategies of IPMP, application of sex pheromone as Mating Disruption tool (MD) has been frequently applied in agriculture fields in different areas of the world (Judd et al., 1997).

Due to the identification of the sex pheromone of the codling moth Cydia pomonella (Roelofs et al., 1971), it was convenient to the use pheromone traps (MD) as a useful tool for insect detection and monitoring how MD is an appropriate method for pest (CM) control on apple crops. The term pheromone was firstly coined by (Karlson and Butenandt (1959), referring to the substances emitted by one individual and eliciting a specific reaction in a second individual of the same species. Pheromones are natural chemicals, usually produced by the female of a species to communicate and signal her presence to potential mates. Based on this normal biological function, pheromones are quite simply defined as, chemical sex attractants. Latter on, Butenandt et al. (1961) identified the first pheromone trans-10, cis-12-hexadecadien-1-ol in commercial silk worm.

The pheromone-baited traps are more routinely used to monitor the flight periods of several adult lepidopteron pests of field and fruit crops (Wilson and Trammel, 1980; Vincent et al., 1990; Delisle, 1992). The strategy can be successfully applied in order to monitor the seasonal activities of CM. Female CM release sex pheromone consist of E.E 8,10-dodecadien-1-01 and Tetradecan-1-01, into the environment enable the male moth to locate them by following the female trial (Brawn et al., 1992).

Very little is known about the performance of pheromone traps (MD technique) under Azad Kashmir conditions or in many other parts of Pakistan. The present study describes the effectiveness of Mating Disruption (MD) technique to control the CM loss on apple (Pome) crops in Azad Kashmir (Pakistan). In this research, data were formulated by assessment of time of pest infestation, peak flight temporal and special variation of CM in two experimented sites A and site B by the use of pheromone traps in order to elucidate the mechanism of application and affectivity of the of Mating Disruption (MD) technique.

However, it is concluded that sexual confusion technique is useful in the context of Integrated Pest Control Programs (IPCP). This study will help farmers of Azad Kashmir to develop effective pest management strategies in apple growing as well as a modal for other apple growing areas of Pakistan and other countries of world.

MATERIALS AND METHODS

Planned field experiments were conducted at two sites of different heights in selected orchards in Azad Kashmir (Rawalakot) in order to monitor the activities of CM on apple (pome) crops. The experiment was conducted during April to September 2004. The biogeographical data of the surveyed orchid are presented in four synthetic pheromone traps (California USA, imported) were installed at two different sites on different heights in two apple orchards.


Table 1: Biogeographical data of the surveyed orchid during the study

Rubber capsule containing 1 mg of codlemone (trans-8, trans-10-dodecadein-1-01) was suspended in the center of the trap.

At the bottom of trap cardboard sheet with sticky material was placed in order to prevent the moth from escaping.

Each pheromone was hung at about on head height in the middle of orchard. The trapped moths were counted and removed on each observation. The codlemone capsules were replaced on after each month. The simultaneous observations were made for all collected moths on all sites of the same locality. Weekly observations were conducted between 11-12 am and data were recorded. An analysis of variance was carried out using (GLM) to compare the mean number of collections of CM on each sampling data between site A and B.

RESULTS AND DISCUSSION

The data indicate that population of CM collected was higher ca. 61 moth in the month of May, as compared with data of September ca. 5 moths, in S. Abbasi orchard A (Table 2). The table also indicates that there was higher population tendency of CM entrapped in May, ca. 78 moths as comparing it with data of September ca. 5 CM, in orchard B. The Table 1 also elucidates clear difference in pest population spatially and temporally. Over the 22 weeks of experiment 4 traps were used on two different sites, two in each orchard. An average of 4.36 and 6.36 moth/trap/week were recorded from site A and B, respectively. So, average number of moth is 5.37 moth/trap/week, which is inline with the findings of (Cranham, 1979).

Comparison between site and date of sampling of CM: An ANOVA test was used to measure the seasonal variation of CM, which showed some significant variation between site and date of sampling (Table 3). The overall population appeared more significant (p<0.005) at site B than site A. In present results more number of moths ca. 281 were record from site B and low number of moths 193 from site A and these results congruently support the previous research (Farooq Ahmad et al., 1999).

The monthly activity appeared highly significant p<0.001 on each sampling date, in month of May population density of CM was higher while less number of population was record in month of September. These results are inline with previous findings (Zaki, 2002; Fadamiro, 2004).

It was recorded that there was no effect of height within the orchard which was an agreement with previous research (Farooq Ahmad et al., 1999) in which it was described that there were no significant differences between caught moths in trap position either at the top of tree or at head height (Table 4).


Table 2: Overall population of codling moth C. pomonella on apple trees at different experimented sites

Table 3: Population of CM with respect to site and height interaction
** = Significant at 1% level *= Significant at 5% level

Table 4: Effects of heights on number of CM collected in Trial

When we compare the results of these two sites A and B it becomes clear that there is no a great difference in moth catchments in the site A and B, which means that inter-traps position show no effect within the orchard but it show great variation at different orchard sites.(Fig. 1).

The experiment results demarcated that number of moth collection reached to its highest peak ca. 61 and 78 moth/trap/week during the first week of May from site A and B, respectively. The second highest peak population with 36 and 70 number of CM was obtained in July from the same site. These results are at par with the findings of Stribu (2000). From the above findings both peak and manolarche activities in two sites indicate that there are two generations of codling moth in experimental area. (Fadamiro, 2004). Hence, it was concluded that CM invasion was more severe in May and July as in comparison with September time. (Fig. 2).

Mechanism of action of MD approach: The mechanism of action of MD technique is based the phenomenon that presence of excessive pheromone confuses male codling moths. Firstly, male moths follow the false pheromone trails created by the release of synthetic pheromone into the wind, thereby making themselves unavailable for mating. Secondly, male moths exposed to high concentrations of pheromone become so desensitized to pheromone that they no longer smell it, or respond. Normally, an insect’s nose, that is it’s antennae, detects the pheromone and sends a message to the brain.


Fig. 1: Population of codling moth C. pomonella with respect to site and height interaction

However, after long exposure to pheromone, neither the antennae nor the brain respond; this is known as Habituation Phenomenon (HP). Thirdly, the highly concentrated synthetic pheromone trails released from dispensers, mask or camouflage, the weaker, natural pheromone trails of female codling moths.

Some constraints of MD technique and suggestions for their solution: As results have explained that higher populations are not a problem if good orchard sanitation precedes pheromone treatment, or if growers apply one cover spray of Guthion at the correct time during the first flight of the season. Mating Disruption has not worked as well in orchards with trees taller than 12-15 ft., unless you also apply a cover spray. We know this is related to the larger canopy volumes in larger trees, which simply means more pheromone is required in taller trees or a lower population to start with. It is more effective to apply a cover spray than it is to put out more pheromone. The major limiting factor to successful use of MD is population density. If initial populations are low enough, most of the problems listed above become unimportant, so everybody should apply that first cover spray the first year they use MD. In the second year of use the spray will probably not be needed.

In general, this technique expounds that MD can be valuable tool to check the pest (CM) attack on apple (pome) crops of Azad Kashmir (Pakistan), if it is explicitly and precisely applied. Albeit, this technique is the most favorable one and environment friendly in IPMP approaches, yet it has some of its limitations.


Fig. 2: Relationship between number or CM and time of sampling

So, detailed mechanism of action of MD technique should be studied and as well as its suitability to the particular habitat should be surveyed prior to its usage. But, sharing and distribution of knowledge about its mechanism of action to the common masses will enhance its utility ratio and affectivity. However, this approach hitherto needs further research for a more widespread use of pheromone application in controlling of CM in pome (apple) crops in Azad Kashmir and Pakistan in order to make this methodology more reliable and more economic to lay man which will boost up the economy at individual, regional and nation wide of the country.

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